The 2016 election of Donald J. Trump exposed a deep divide in American politics and culture, one that pollsters and pundits didn't seem to realize was there. But Trump did, and he used it to his advantage in ways that surprised nearly everyone, even those who voted for him. Perhaps the biggest question on many people's minds is how, exactly, did a crass, unrepentant reality TV star and cutthroat business tycoon secure the majority of the religious...