Could a plague of biblical proportions be America’s best hope for religious revival? As the 75th anniversary of the end of World War II approaches, there is reason to think so.

Three-quarters of a century has dimmed the memory of that gruesome conflict and its terrible consequences: tens of millions killed, great cities bombed to rubble, Europe and Asia stricken by hunger and poverty. Those who survived the war had to grapple with the kinds of profound questions that only arise in the aftermath of calamity. Gazing at the ruins...