Matthew Stewart wants to make one thing perfectly clear: The United States was not founded as a Christian nation. The principles that inspired the American Revolution, he argues in “Nature’s God: The Heretical Origins of the American Republic,” belong to an intellectual tradition dating to ancient Greece and reviled by every variety of Christian — early church fathers, Catholic clergy and Protestant divines alike. Rooted in the philosophy of Epicurus, who saw happiness as the highest good, this tradition flowered... Read more