This book explores the rich field of law and religion in an accessible and balanced way. The Fourth Edition is incredibly up to date, including all major cases decided through Spring 2021, including Espinoza v. Montana Department of Revenue, Our Lady of Guadalupe School v. Morrissey-Berru, the Covid Exemption cases, American Legion v. American Humanist Association, Masterpiece Cakeshop v. Colorado Civil Rights Commission, Trinity Lutheran v. Comer, just to name a few. It addresses the continuing debate over the meaning of the Religion Clauses of the First Amendment and the evolution of church/state Law. The Fourth Edition also updates key issues and developments in religious law systems, in the constitutional approaches to the protection of religious liberties outside the United States, and within the developing jurisprudence of regional and international human rights systems.