The Triumph of Christianity From the New York Times bestselling authority on early Christianity, Bart D. Ehrman unravels the story of how Christianity grew from a religion of hand full of peasants in rural Galilee to the dominant religion in the West in less than four hundred years. In The Triumph of Christianity, Bart D. Ehrman, a master explainer of Christian history, texts, and traditions, shows how a religion whose first believers were illiterate day laborers in a remote part of the empire became the official religion of Rome.