....the constitution of the new, post-Taliban Afghani regime stipulates that “no law can be contrary to the beliefs and provisions of the sacred religion of Islam.”

Abdul Rahman’s case showed that Islam’s traditional classification of apostasy as a capital crime would be included in this.

The prophet Muhammad regarded apostasy from Islam as a supreme evil, and one of the main reasons the punishment is so severe is because apostates were once Muslims but “turn renegade.”

Muhammad decreed that no Muslim could be put to death except for murder, unlawful sexual intercourse, and apostasy.

He said flatly: “Whoever changed his Islamic religion, then kill him.”

This is still the position of all the schools of Islamic jurisprudence

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Religion Of Peace by Robert Spencer