The 1920s saw one of the most striking revolutions in manners and morals to have marked North American society, affecting almost every aspect of life, from dress and drink to sex and salvation. Protestant Christianity was being torn apart by a heated controversy between traditionalists and the modernists, as they sought to determine how much their beliefs and practices should be altered by scientific study and more secular attitudes. Out of the controversy arose the Fundamentalist movement, which has become a powerful force in twentieth-century America.

During this decade, hundreds (and...