The proper role of religious faith in the public life of a liberal democracy is one of the most important and controversial issues in the United States today. Since the publication in 1991 of his book Love and Power, Michael J. Perry’s important writings on this issue have been among the most insightful. In this new book, Perry argues that political reliance on religious faith violates neither the Establishment Clause of the United States Constitution nor, more broadly, the morality of liberal democracy. Nonetheless, Perry argues, religious believers sometimes have good reasons to be wary about relying on religious beliefs in making political decisions. Along the way, Perry thoughtfully addresses three subjects at the center of fierce contemporary political debate: school vouchers, same-sex marriage, and abortion.