In some ways, this book fits into the long tradition of textbooks on Judaism, Christianity, and Islam. It seeks to teach the basics both of the study of religion and the study of the religions themselves. For each religion, it presents the trajectories of development over time, the main theological debates and claims, the sacred writings, and the common practices and holy days. Yet, in other ways, this book is like no other introductory textbook on Judaism, Christianity, and Islam. Rather than claim to show the "essence" of Judaism, Christianity, or Islam, this book shows the diversity within Jewish, Christian, and Islamic experience, theological dispute, and practice. Rather than rely solely on the traditional theorists of religion, the "giants," this book updates the approach, relying also on the newest critical thinkers on defining, classifying, and studying religion. Rather than present Latter-Day Saints and Baha'i Religion as among the New Religious Movements, this book treats them as part of the continuing history of religion, growing out of and within Christianity and Islam respectively. Religion, in other words, is not a thing of the past. It's happening right now, all around us.