He is rich, famous, handsome, and adored by millions of fans on television each week, but he's not an actor. He's an evangelical pastor from Houston named Joel Osteen. They call him "the smiling preacher," and Osteen has a lot to smile about. He's the head of the largest church in America, the author of a best-selling book, and the religious leader for a following of faithful, often frenzied fans. He's achieved all that with an approach critics call "Christianity lite" — no sin, no suffering, no sacrifice, replacing fire and brimstone with a motivational message. Barbara Walters asked Osteen...