Today, two-thirds of all Arab Muslims are under the age of thirty. Young Islam takes readers inside the evolving competition for their support--a competition not simply between Islamism and the secular world, but between different and often conflicting visions of Islam itself.

Drawing on extensive ethnographic research among rank-and-file activists in Morocco, Avi Spiegel shows how Islamist movements are encountering opposition from an unexpected source--each other. In vivid and compelling detail, he describes the conflicts that arise as Islamist groups vie with one another...