Short answer

Muslims bury because God (﷾) taught burial and the Prophet (ﷺ) practised it. The Qur'an tells of the first burial, when a raven showed a son of Adam how to cover his brother. It names the grave among God's (﷾) dealings with man. All four schools of Islamic law agree that burial is a duty on the community. The dead keep their honour too: breaking a dead man's bone is like breaking it in life. Hindus cremate because their texts treat fire as a last offering and the body as clothes cast off. Many Buddhists cremate after the Buddha's example, and most Sikhs cremate too. Burial is not a condition of resurrection. God (﷾) raises the burned as surely as the buried. So burial is obedience and honour, and no one is lost because of a fire. Each person's end rests with God (﷾), who judges faith and deeds.

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