Abdo is the author of No God But God: Egypt and the Triumph of Islam (2000), Mecca and Main Street: Muslim Life in America After 9/11, (2006), the monograph The New Sectarianism (Saban Center for Middle East Policy, 2013), and co-author of Answering Only to God: Faith and Freedom in Twenty-First Century Iran (2003). No God But God documents the social and political transformation of Egypt into an Islamic society and details leading figures and events responsible for giving moderate Islamists in Egypt enormous social and political power. Answering Only to God seeks to explain the theological struggle in Iran among the Shiite clerics and how it has led to political stagnation.