The struggle within American Christianity now-as it has been throughout our nation's history-is between the head and the heart, reason and emotion, Enlightenment and Evangelism. The same patterns recur: a cooling of popular religious fervor is followed by a grassroots explosion in evangelical activity. This landmark analysis concludes that religion is a fertile and enduring force in American politics and-while it is necessary to be vigilant against efforts to infuse government policy with Christianity-the tension between the two is necessary, inevitable, and unending. Book jacket.