One of the most controversial episodes in the life of the Prophet Muhammad concerns an incident in which he allegedly mistook words suggested by Satan as divine revelation. Known as the Satanic verses, these praises to the pagan deities contradict the Islamic belief that Allah is one and absolute. Muslims today--of all sects--deny that the incident of the Satanic verses took place. But as Shahab Ahmed explains, Muslims did not always hold this view.

Before Orthodoxy wrestles with the question of how religions establish truth--especially religions such as Islam that lack a...