The Triumph of Christianity by Bart D. Ehrman

The "marvelous" (Reza Aslan, bestselling author of Zealot), New York Times bestselling story of how Christianity became the dominant religion in the West.
How did a religion whose first believers were twenty or so illiterate day laborers in a remote part of the empire became the official religion of Rome, converting some thirty million people in just four centuries? In The Triumph of Christianity, early Christian historian Bart D. Ehrman weaves the rigorously-researched answer to this question "into a vivid, nuanced, and enormously readable narrative" (Elaine Pagels, National Book Award-winning author of The Gnostic Gospels), showing how a handful of charismatic characters used a brilliant social strategy and an irresistible message to win over hearts and minds one at a time.

This "humane, thoughtful and intelligent" book ( The New York Times Book Review) upends the way we think about the single most important cultural transformation our world has ever seen-one that revolutionized art, music, literature, philosophy, ethics, economics, and law.