Hell, thanks to author and hipster pastor Rob Bell, is in the news. Or rather the absence of hell—or its maybe-absence—or its maybe-temporary-reality. It's tough to sort out exactly what Bell thinks. Many progressive Christians—not just Rob Bell—are embarrassed that most evangelicals still believe in hell. Hell, to their ears, seems mean, cruel, and vindictive. Others caricature it, scoffing at the notion of pitchforks, demons, and burning coals. But Hell is nothing to apologize for or laugh about. It's real, it's indispensable,...