This book chronologically analyzes fourteen key US Presidents, from Washington to Biden, to highlight how religion has informed or influenced their politics and policies. For years, leading scholars have largely neglected religion in presidential studies. Yet, religion has played a significant role in a number of critical presidencies in US history. This volume reveals the deep religious side to such presidents as Truman, Eisenhower, and Reagan, among others, and the impact that faith had on their administrations. Now in its fourth edition, this work includes analysis of Joe Biden as the second Catholic president in United States history and provides a timely update to a key text in the study of religion and the presidency.