The struggle within American Christianity, Garry Wills argues, now and throughout our country's history, is between the head and the heart: between reason and emotion, Enlightenment and Evangelism. Why has this been so? How has the tension between the two poles played out, and with what consequences, over the past 400 years? How 'Christian' is America, after all? As Wills examines the key movements and personalities that have transformed America's religious landscape, we see again and again the same pattern emerge: a cooling of popular religious fervor followed by a grassroots explosion in evangelical activity, generally at a time of great social transformation and anxiety. From the Puritans to today's presidential administration of George W. Bush, Wills examines Christianity in America.