The backstory to Elaine Pagels’s The Origin of Satan, Revelations, and groundbreaking studies of the Gnostic gospels is as much emotional as scholarly. As she realized when she was asked Why Religion? (Ecco, $27.99) her own life illuminates both why she’s made a career of studying religious texts as well as why religion itself still exists in the supposedly secular 21^st-century. The daughter and wife of scientists, Pagels was taught early on to trust the rational, despite her biologist father’s unpredictable bouts of rage. At fifteen she went with friends to a Billy Graham crusade and was astonished, hearing Graham preach about nuclear weapons, to learn that science wasn’t always trustworthy. She was also intrigued by the shared spectacle of music and ritual, and craved experiences that would similarly “engage the imagination.” Pagels fell away from evangelicalism soon after finding it, but she continued to look for, and discover, experiences that could only be called spiritual. Then in 1987 Pagels’s five-year old son died, followed in July 1988 by the death of her husband, the physicist Heinz Pagels. Struggling to face these incomprehensible losses, Pagels plunged into the Gnostic gospels once again, she discovered other ways to shape grief and to interpret the problem of suffering in the world.