Short answer
Islam shares some of what a Jain values, and adds what Jainism leaves out. You hold that living creatures are not to be harmed, that each soul answers for its own deeds, and that a person must master himself. Islam keeps the accountability and the restraint. It adds a Creator who needs nothing and hears every call. It adds a Book kept as it came, mercy for a soul that cannot free itself, and the last messenger (ﷺ). The real change is to worship Allah (﷾) alone and take your guidance from the Qur'an. It also means holding one life and then the Day, in place of many lives. Islam does not teach ahimsa as Jainism does, but it asks no one to eat meat. It is one whole way of life for every believer.
Full explanation
What Jains hold dear
Jains hold non-violence (ahimsa) to be the first vow, and they teach that each soul answers for its own deeds. The Svetambara Uttaradhyayana Sutra, in Hermann Jacobi's English of 1895, says that neither kinsmen nor friends will share a man's suffering. He alone has to bear it, for "the Karman follows the doer" (karma, the deeds that cling to the soul). The Digambaras keep a different set of scriptures. Both traditions agree, though, that non-violence is the first of the lay vows.
“Neither his kinsmen, nor his friends, nor his sons, nor his relations will share his suffering, he alone has to bear it; for the Karman follows the doer.”
Jaini writes that the first of the layman's basic vows (anuvratas) is ahimsa, non-harming, which he calls the most central concept of Jaina ethics. His note adds that all Jaina sects agree on the identity and nature of the anuvratas (p. 170).
What Islam shares
Islam shares the weight of each soul's deeds. The Qur'an says that every soul draws the reward of its acts on none but itself. No bearer of burdens can bear the burden of another (6:164). Whoever has done an atom's weight of good or of evil will see it (99:7-8). Each person's own record will be laid open to him (17:13-14). Islam shares restraint too. Fasting is prescribed so that you may learn self-restraint (2:183). It shares mercy too. The Qur'an says of the Prophet (ﷺ), "We sent thee not, but as a Mercy for all creatures" (21:107). He said that a woman entered the Fire because of a cat she kept tied up. She neither fed it nor let it go to find its own food (Bukhari 3318). Islam is not the same as ahimsa, and a block below says where the two differ.
“Say: "Shall I seek for (my) Cherisher other than Allah, when He is the Cherisher of all things (that exist)? Every soul draws the meed of its acts on none but itself: no bearer of burdens can bear the burden of another. Your goal in the end is towards Allah: He will tell you the truth of the things wherein ye disputed."”
“Then shall anyone who has done an atom's weight of good, see it! And anyone who has done an atom's weight of evil, shall see it.”
“Every man's fate We have fastened on his own neck: On the Day of Judgment We shall bring out for him a scroll, which he will see spread open. (It will be said to him:) "Read thine (own) record: Sufficient is thy soul this day to make out an account against thee."”
“O ye who believe! Fasting is prescribed to you as it was prescribed to those before you, that ye may (learn) self-restraint,-”
“We sent thee not, but as a Mercy for all creatures.”
Ibn Umar reports that the Prophet (ﷺ) said a woman entered the Fire because of a cat she kept tied up, neither feeding it nor letting it go to find its own food.
What Islam adds: a Creator who needs nothing, and hears
Jainism denies a Creator. The page "Do the Jain arguments against a Creator hold?" takes those arguments one at a time. The Qur'an describes One who is Allah (﷾), the Eternal, who begets not and is not begotten, and who has no equal (112). He is the Creator of the heavens and the earth. There is nothing whatever like Him, and He hears and sees all things (42:11). He is free of all wants, and it is we who need Him (35:15). He says, "No Sustenance do I require of them" (51:57-58). Yet He is close. He listens to the prayer of every suppliant when he calls on Him (2:186). He says, "Call on Me; I will answer your (Prayer)" (40:60). The page "If the Jinas do not answer prayers, who does?" asks who it is that hears. What Islam adds is not a technique. It is Someone to turn to.
“Say: He is Allah, the One and Only; Allah, the Eternal, Absolute; He begetteth not, nor is He begotten; And there is none like unto Him.”
“(He is) the Creator of the heavens and the earth: He has made for you pairs from among yourselves, and pairs among cattle: by this means does He multiply you: there is nothing whatever like unto Him, and He is the One that hears and sees (all things).”
“O ye men! It is ye that have need of Allah: but Allah is the One Free of all wants, worthy of all praise.”
“No Sustenance do I require of them, nor do I require that they should feed Me. For Allah is He Who gives (all) Sustenance,- Lord of Power,- Steadfast (for ever).”
“When My servants ask thee concerning Me, I am indeed close (to them): I listen to the prayer of every suppliant when he calleth on Me: Let them also, with a will, Listen to My call, and believe in Me: That they may walk in the right way.”
“And your Lord says: "Call on Me; I will answer your (Prayer): but those who are too arrogant to serve Me will surely find themselves in Hell - in humiliation!"”
A Book kept as it came
The two great Jain traditions do not share one canon. Two pages set out, with sources, what the Jain traditions themselves say about their scriptures. They are "Were the Jain scriptures preserved?" and "Which Jain canon holds Mahavira's words?". Islam makes a narrow claim that can be checked. God (﷾) says, "We have, without doubt, sent down the Message; and We will assuredly guard it (from corruption)" (15:9). The page "How was the Qur'an preserved?" shows how.
“We have, without doubt, sent down the Message; and We will assuredly guard it (from corruption).”
Mercy for a soul that cannot free itself
Jainism teaches that a soul frees itself by its own effort. Islam commands effort, and weighs every deed down to an atom's weight (99:7-8). Its reason for adding mercy is this. Effort can stop a wrong from being repeated, but it does not undo a wrong already done. Islam holds that every wrong is done before God (﷾), and that He is the One who forgives. So it says no one is saved by deeds alone. The Prophet (ﷺ) said that no one's deeds will save him. Asked whether that included him, he said: not even me, unless Allah (﷾) covers me with His mercy. He then told them to do good deeds properly, sincerely and in moderation (Bukhari 6463). So effort is commanded, and mercy is what carries it. The door also stays open. God (﷾) says, "Despair not of the Mercy of Allah: for Allah forgives all sins" (39:53). The page "How is a Muslim saved? Do Muslims earn Paradise by good works?" sets it out.
“He who conquers himself through himself, will obtain happiness.”
“Then shall anyone who has done an atom's weight of good, see it! And anyone who has done an atom's weight of evil, shall see it.”
Abu Hurayra reports that the Prophet (ﷺ) said no one's deeds will save him. Asked whether that included him, he said: not even me, unless Allah covers me with His mercy. He then told them to do good deeds properly, sincerely and in moderation.
“Say: "O my Servants who have transgressed against their souls! Despair not of the Mercy of Allah: for Allah forgives all sins: for He is Oft-Forgiving, Most Merciful.”
One life, then the Day
The Uttaradhyayana Sutra speaks of the soul turning round and round in the Circle of Births (Uttaradhyayana 33.1, Svetambara). Islam teaches one life before the Day of Resurrection. The Qur'an says that every soul shall have a taste of death, and that to Allah (﷾) we must return (21:35). On that Day each person's own record is laid open to him (17:13-14). In Islam the one who did the deed is the one recompensed for it. The page "Is karma just?" takes up karma and rebirth.
“I shall now in due order explain the eight kinds of Karman, bound by which the soul turns round and round in the Circle of Births.”
“Every soul shall have a taste of death: and We test you by evil and by good by way of trial. to Us must ye return.”
“Every man's fate We have fastened on his own neck: On the Day of Judgment We shall bring out for him a scroll, which he will see spread open. (It will be said to him:) "Read thine (own) record: Sufficient is thy soul this day to make out an account against thee."”
One way of life for every believer
Jainism honours monks and nuns for their vows. Islam has no separate higher path for those who leave the household. Three men once vowed to pray all night for ever, to fast every day without a break, and never to marry. The Prophet (ﷺ) told them that he feared Allah (﷾) more than they did. Yet he fasted and broke his fast, prayed and slept, and married (Bukhari 5063). So the householder and the worker can be close to God (﷾) in daily life. The Qur'an calls believers to enter Islam whole-heartedly (2:208), and says that God (﷾) has perfected the religion for them (5:3). Belief, worship, law, family and character are one way of life. The page "Why are there no monks in Islam, and no vows to stay single?" gives more. The page called What is Islam? shows it whole.
Anas ibn Malik reports that three men asked about the Prophet's (ﷺ) worship and thought their own too little. One vowed to pray all night for ever, one to fast every day without a break, and one to keep away from women and never marry. The Prophet told them that he feared Allah more than they did, yet he fasted and broke his fast, prayed and slept, and married. Whoever turns away from his way, he said, is not of him.
“O ye who believe! Enter into Islam whole-heartedly; and follow not the footsteps of the evil one; for he is to you an avowed enemy.”
“This day have I perfected your religion for you, completed My favour upon you, and have chosen for you Islam as your religion.”
Where Islam and the first vow differ
Here Islam and Jainism differ, and this page does not hide it. Islam permits eating the meat of cattle (16:5) and of animals slaughtered with Allah's (﷾) name spoken over them (6:118). It does not require anyone to eat meat, so a Jain who becomes Muslim is not made to. But no Muslim may count meat forbidden, since God (﷾) says, "make not unlawful the good things which Allah hath made lawful for you" (5:87). Islam commands mercy at the kill. The Prophet (ﷺ) said that Allah (﷾) has prescribed excellence in everything. So when you slaughter, slaughter well: sharpen the blade and spare the animal suffering (Muslim 1955). The page "Does Islam teach kindness to animals?" gives more.
“And cattle He has created for you (men): from them ye derive warmth, and numerous benefits, and of their (meat) ye eat.”
“So eat of (meats) on which Allah's name hath been pronounced, if ye have faith in His signs.”
“O ye who believe! make not unlawful the good things which Allah hath made lawful for you, but commit no excess: for Allah loveth not those given to excess.”
Shaddad ibn Aws reports that the Prophet (ﷺ) said Allah has prescribed excellence in everything. So when you slaughter, slaughter well: sharpen the blade and spare the animal suffering.
The last messenger, and a book you can test
Islam holds that God's (﷾) guidance was completed with the Qur'an. It asks nobody to take this on trust. The Qur'an invites the doubter to produce a sura (chapter) like it (2:23) and to look for discrepancy in it (4:82). If the Qur'an is from God (﷾), then its word that Muhammad (ﷺ) is the Seal of the Prophets (33:40) is His word. Islam does not ask you to mock Mahavira or any Jain. The Qur'an tells believers to invite with wisdom and beautiful preaching, and to argue in the way that is best and most gracious (16:125).
“And if ye are in doubt as to what We have revealed from time to time to Our servant, then produce a Sura like thereunto; and call your witnesses or helpers (If there are any) besides Allah, if your (doubts) are true.”
“Do they not consider the Qur'an (with care)? Had it been from other Than Allah, they would surely have found therein Much discrepancy.”
“Muhammad is not the father of any of your men, but (he is) the Messenger of Allah, and the Seal of the Prophets: and Allah has full knowledge of all things.”
“Invite (all) to the Way of thy Lord with wisdom and beautiful preaching; and argue with them in ways that are best and most gracious: for thy Lord knoweth best, who have strayed from His Path, and who receive guidance.”
The real change Islam asks
Islam does ask a real change, and it is better to say so plainly. Many Jains honour the Jinas with images in their temples. Islam asks that worship and prayer go to Allah (﷾) alone, and that no one be invoked along with Him (72:18; 40:60). It asks you to take your guidance from the Qur'an and the last Prophet (ﷺ), not from the Jain scriptures. It asks you to hold that there is one life and then the Day, in place of many lives. It does not ask you to stop caring for living creatures, as the mercy above shows. It does not ask you to look down on anyone.
“"And the places of worship are for Allah (alone): So invoke not any one along with Allah;”
“And your Lord says: "Call on Me; I will answer your (Prayer): but those who are too arrogant to serve Me will surely find themselves in Hell - in humiliation!"”
“We sent thee not, but as a Mercy for all creatures.”
Islam's answer: restraint is the start
Jainism and Islam both ask for restraint and for a reckoning. The question is where the road goes from there. Being good is the start, not the end. The Qur'an says that man is in loss, except those who believe, do righteous deeds, and urge one another to truth and patience (103:1-3). It says that every soul returns to Allah (21:35). Islam is a whole way of life: belief, worship, law, family and character together. The page on following the religion you were born into takes up family and tradition. Islam asks you to read the Qur'an in a translation you trust and to test it. Then ask whether Muhammad (ﷺ) is the last prophet God (﷾) sent (33:40).
“By (the Token of) Time (through the ages), Verily Man is in loss, Except such as have Faith, and do righteous deeds, and (join together) in the mutual teaching of Truth, and of Patience and Constancy.”
“Every soul shall have a taste of death: and We test you by evil and by good by way of trial. to Us must ye return.”
“O ye who believe! Enter into Islam whole-heartedly; and follow not the footsteps of the evil one; for he is to you an avowed enemy.”
“This day have I perfected your religion for you, completed My favour upon you, and have chosen for you Islam as your religion.”
“And if ye are in doubt as to what We have revealed from time to time to Our servant, then produce a Sura like thereunto; and call your witnesses or helpers (If there are any) besides Allah, if your (doubts) are true.”
“Muhammad is not the father of any of your men, but (he is) the Messenger of Allah, and the Seal of the Prophets: and Allah has full knowledge of all things.”
Five fears and replies
Acaranga Sutra 1.4.1.1 — book 1, lecture 4 (Righteousness), lesson 1, verse 1
“all breathing, existing, living, sentient creatures should not be slain, nor treated with violence, nor abused, nor tormented, nor driven away.”
Cited for
Non-violence is the first vow and the highest duty. Islam allows animals to be killed and eaten.
The response
It does, and Islam does not hide the difference. It permits the meat of cattle (16:5) and of animals slaughtered with Allah's (﷾) name (6:118). It does not require anyone to eat meat. But no Muslim may count it forbidden (5:87). It teaches mercy. The Prophet (ﷺ) said to slaughter well and spare the animal suffering (Muslim 1955). A woman entered the Fire because of a cat she kept tied up without food (Bukhari 3318). The question between us is who sets the limit on how life may be used, and Islam says the Creator does.
Where it lands — Islam is not the same as ahimsa. It forbids cruelty, asks for mercy to every creature (21:107), and requires no one to eat meat.
Uttaradhyayana Sutra 9.35 — lecture 9 (The Pravragya of King Nami), verse 35
“He who conquers himself through himself, will obtain happiness.”
Cited for
I must conquer myself through myself. If grace does the work, effort is pointless.
The response
Islam does not say effort is pointless. Every deed is weighed, down to an atom's weight (99:7-8). The Prophet (ﷺ) said that no one's deeds alone will save him, not even his, unless Allah (﷾) covers him with His mercy. He then told them to do good deeds properly, sincerely and in moderation (Bukhari 6463). Effort can stop a wrong from being repeated, but it does not undo a wrong already done. Islam holds that God (﷾) is the One who forgives. Effort is commanded, and mercy carries it.
Where it lands — Both ask for the effort. Islam adds that the effort is met by the mercy of the One who made you.
Uttaradhyayana Sutra 13.23 — lecture 13 (Citra and Sambhuta), verse 23
“Neither his kinsmen, nor his friends, nor his sons, nor his relations will share his suffering, he alone has to bear it; for the Karman follows the doer.”
Cited for
The Karman follows the doer, and no one can share it. Nobody can forgive me.
The response
Islam agrees that no bearer of burdens can bear the burden of another (6:164). But a wrong is done before God (﷾), and He is the One who forgives. He says, "Despair not of the Mercy of Allah: for Allah forgives all sins" (39:53). Islam also says the record is laid open and not one deed is lost (17:13-14; 99:7-8). Mercy takes nothing from any deed that is weighed.
Where it lands — Each soul answers for itself in both. Islam adds the One who may forgive.
Uttaradhyayana Sutra 28.3 — lecture 28 (The Road to Final Deliverance), verse 3
“Right knowledge, faith, conduct, and austerities; beings who follow this road, will obtain beatitude.”
Cited for
Right knowledge, faith, conduct and austerity are a complete road. I am a good Jain and a good person.
The response
Allah (﷾) looks at hearts and deeds (Muslim 2564), so Muslims judge no one's heart. Goodness is the start. The Qur'an joins belief and righteous deeds (103:1-3) and says that to Allah (﷾) every soul returns (21:35). It teaches that God (﷾) does not punish until He has sent a messenger (17:15). Islam asks you to weigh the message that has reached you, and the Qur'an asks to be tested (2:23; 4:82).
Where it lands — Being good is the start. The question is whether the Qur'an is true, and Islam asks you to test it.
Uttaradhyayana Sutra 32.111 — lecture 32 (The Causes of Carelessness), verse 111
“We have taught the way how to become exempt from all misery which arises since time without beginning; those beings who follow it will in their time become infinitely happy.”
Cited for
I was born a Jain and my family live this way. Why leave the road the Jinas taught?
The response
Islam does not ask you to stop honouring your parents. The Qur'an joins kindness to parents to the worship of God (﷾) and forbids even a word of contempt to them (17:23-24). But the question is whether a way is true, not whom you were born to. The Qur'an says that whoever receives guidance receives it for his own benefit. No bearer of burdens can bear the burden of another (17:15). So each person must weigh the message for himself. The page on following the religion you were born into takes this up.
Where it lands — Kindness to family stays. Whether the Qur'an is God's (﷾) word is the one question to test.
Perspectives
Jain: restraint and self-effort are already a whole path
A Jain can say that the Jina's teaching gives a complete road. It has non-violence, an honest reckoning of one's own deeds, mastery of the self, and right knowledge, faith and conduct. A Jain may add that he was born into it and that his family live it. So why look elsewhere?
The Svetambara Acaranga Sutra says that all breathing, living creatures should not be slain or tormented. Islam allows the killing of animals, so ahimsa is higher.
Rebuttal
Islam teaches mercy to every creature (21:107), and cruelty to a cat is named as a cause of the Fire (Bukhari 3318). Slaughter must be done well (Muslim 1955), and no one who becomes Muslim must eat meat. The difference is that Islam holds the Creator permitted it (16:5).
The Karman follows the doer, and neither kinsmen nor friends will share his suffering (Uttaradhyayana 13.23, Svetambara). Each soul answers alone, so nothing more is needed.
Rebuttal
Islam agrees that no bearer of burdens can bear the burden of another (6:164). It adds that the One a wrong was done before can forgive it, and He forgives all sins to the one who turns back (39:53).
He who conquers himself through himself will obtain happiness (Uttaradhyayana 9.35, Svetambara). A soul frees itself by its own effort, and grace would make effort pointless.
Rebuttal
Islam commands effort and weighs every deed (99:7-8). The Prophet (ﷺ) said no one is saved by deeds alone, then told them to do good deeds properly, sincerely and moderately (Bukhari 6463).
Right knowledge, faith, conduct and austerities are the road (Uttaradhyayana 28.3, Svetambara). I am a good Jain and a good person, so I need nothing more.
Rebuttal
Goodness is a fine start, and only Allah (﷾) sees the heart (Muslim 2564). The Qur'an joins belief and righteous deeds (103:1-3) and says that every soul returns to Allah (21:35). It invites a test (4:82).
The Islamic perspective
Islam shares what is true in what a Jain holds: each soul answers for its own deeds, restraint matters, and mercy to living things matters. It adds a Creator who needs nothing and hears, and a Book kept as it came. It adds mercy for a soul that cannot free itself and one way of life for every believer. It adds the last messenger, with a book to test. Belief, worship, law, family and character are one way of life.
In Islam too each soul draws the reward of its acts on itself. No bearer of burdens bears another's, and every deed down to an atom's weight is seen.
Islam shares restraint and mercy. Fasting is prescribed to teach self-restraint, and the Prophet (ﷺ) was sent as a mercy to all creatures. Cruelty to a cat is named as a cause of the Fire.
The Creator of the Qur'an is One, eternal, begetting none and begotten of none. Nothing is like Him, He hears and sees, He is free of all wants, and He needs nothing from what He made.
He is close to every caller, listens to the prayer of every suppliant and answers it.
God (﷾) says He has sent down the Message and will guard it from corruption. This is a narrow claim that can be checked.
Effort is commanded and every deed is weighed, yet no one is saved by deeds alone. Mercy is what carries the effort, and God (﷾) forgives all sins to the one who turns back to Him.
Islam teaches one life before the Day. Then each person's own record is opened, and to Allah (﷾) every soul returns.
Islam has no higher path for those who leave the household. The Prophet (ﷺ) fasted and broke his fast, prayed and slept, and married, and Islam is one whole way of life.
Islam permits the meat of cattle and of animals slaughtered with Allah's (﷾) name. It requires no one to eat meat, and it commands mercy and good slaughter.
The Qur'an invites everyone to test it. The tests are to produce a sura like it and to look for discrepancy. It calls Muhammad (ﷺ) the Seal of the Prophets.
The change Islam asks is real. It is to direct worship and prayer to Allah (﷾) alone and invoke no one along with Him. It is also to take guidance from the Qur'an and the last Prophet (ﷺ). Islam asks Muslims to invite others with wisdom and in the best and most gracious way.
Restraint is the start, not the end. The Qur'an joins belief with good deeds, and every soul returns to Allah (﷾).