Khaled Abou El Fadl, a prominent critic of Islamic puritanism, leads off this lively debate by arguing that Islam is a deeply tolerant religion. Injunctions to violence against nonbelievers stem from misreadings of the Qur'an, he claims, and even jihad, or so-called holy war, has no basis in Qur'anic text or Muslim theology but instead grew out of social and political conflict. Many of Abou El Fadl's respondents think differently. Some contend...