“Every generation of Christians and Muslims yields up its crop of madmen and howlers at the moon, and they always spook the rationalists of their eras. A previous generation noted with concern the Iranian revolution's rhetoric of apocalypse. More than half of American evangelicals believe, or profess to believe, in imminent doomsday. Luckily, most apocalyptic movements sputter out, soften their tone, or turn out to be bluffing. Many of the Iranian revolutionaries who thought the Ayatollah Khomeini would reveal himself as the Mahdi—a messianic figure said my most Shia to have been in hiding since 941—now deny they ever believed such a thing. The ruling mullahs are at least as interested in trade agreements as in nuclear weapons. As for American evangelicals, they claim to believe they live in the end times, but they still contribute to their retirement accounts. There is similar reassurance in the belief that when a jihadist tells you he wants to kill you and billions of others to bring about the end of the world, he is just speaking for effect.”