The book seeks to discuss and explore the journey of Islam as an ideology from the time of its origin to the present, particularly in respect of three schools namely, Wahhabism, Deoband, and Tablighi, which have come to dominate the discourses on the radical stream of contemporary Islam. It explains how the idea of puritan Islam delves into the terrain of political Islam and forms an ideology that is exclusivist in nature and poses a serious threat to democratic pluralism and secularism. It elucidates how the concept of puritan Islam becomes a powerful source for the Islamic organisations to preach, propagate and network the gospel of Islamic terrorism and how and why the moderate voices from the Islamic communities have failed to respond to these challenges.