The Enlightenment and Darwinism posed threats to traditional Christianity. So why have so many highly educated Americans remained committed believers?The Search for a Rational Faith challenges popular theories of secularization with a sweeping 400-year history of Anglo-American Protestant defenses of the Christian faith. Through a detailed study of the arguments of those who found Christian faith compatible with Enlightenment reason, Daniel K. Williams explains why Christian faith has continued to remain a viable intellectual option in the United States even for educated people who accept modern science. From the seventeenth-century New England Puritans who founded Harvard College to the twentieth-century university professors who believed that Christian theism was the only viable grounding for morality in the atomic age, faith and reason have been an integral part of the Anglo-American experience. This book chronicles that story. It is a story that intersects with the spiritual lives of well-known figures such as Isaac Newton, John Locke, John Adams, Harriet Beecher Stowe, Reinhold Niebuhr, and Martin Luther King Jr., all of whom wrestled with the question of the reason to believe. It is the story of Christian apologists who crafted intellectually sophisticated defenses of the faith. And above all, it is the story of the development of an idea-the idea that there is a rational basis for Christian belief.This book shows how that idea was transmitted from England to America in the seventeenth century and how it continued to develop and transform over the next four centuries in response to the Enlightenment, Darwinian evolution, historical criticism of the Bible, new theories of religious epistemology, and the ethical challenge of the civil rights movement. The Search for a Rational Faith is the story of what that idea meant in the past and what it still means today, in a new era of secularization.