"In 2012, Dr. Karen King, a star professor at the Harvard Divinity School, announced a blockbuster discovery at a scholarly conference just steps from the Vatican: She had found an ancient fragment of papyrus in which Jesus calls Mary Magdalene "my wife." The discovery made front-page news around the world - if early Christians believed that Jesus was married, it would threaten not just the celibate, all-male priesthood, but the entire the 2,000-year...