Joel Osteen is an ecclesiastical phenomenon, an American, evangelical, charismatic, postmodern, megachurch, media savvy, health/wealth/motivational speaker, gospel-preacher phenomenon. A 59-year-old who doesn’t look it, Osteen seems made for the media — razor thin, self-effacing, pragmatic and guileless to a fault, Tom Sawyer with mousse. His sermons are folksy, positive, upbeat and encouraging, preceded each Sunday...