Sacred underwear, baptizing holocaust victims, gods of their own planets. When some of America’s most celebrated pundits and public intellectuals talk about Mormons, these are the images that are summoned. Ironically in this “Mormon Moment”—signaled by a hit Broadway musical, polygamous housewives on TLC, and of course two Mormon presidential candidates—Mormons, long considered quintessential “outsiders” to mainstream American culture, today find themselves at the center of the American zeitgeist. Yet it is the Mormons’ supposed theological weirdness that is the centripetal attraction. As Joanna Brooks has noted in these pages, the New York Times recently featured Harold Bloom’s musings on...