M. Hakan Yavuz offers an insightful and wide-ranging study of the Gulen Movement, one of the most imaginative developments in contemporary Islam. Founded in Turkey by the Muslim thinker Fethullah Gulen, the Gulen Movement aims to disseminate a ''moderate'' interpretation of Islam through faith-based education. Its activities have fundamentally altered religious and political discourse in Turkey in recent decades, and its schools and other institutions...