Whatever the reason, when cultural conservatives disengage from organized religion, they tend to redraw the boundaries of identity, de-emphasizing morality and religion and emphasizing race and nation. Trump is both a beneficiary and a driver of that shift.
So is the alt-right. Read Milo Yiannopoulos and Allum Bokhari’s famous Breitbart.com essay, “An Establishment Conservative’s Guide to the Alt-Right.” It contains five references to “tribe,” seven to “race,” 13 to “the west” and “western” and only one to “Christianity.” That’s no coincidence. The alt-right is ultra-conservatism for a more secular age. Its leaders like Christendom, an old-fashioned word for the West. But they’re suspicious of Christianity itself, because it crosses boundaries of blood and soil. As a college student, the alt-right leader Richard Spencer was deeply influenced by Friedrich Nietzsche, who famously hated Christianity. Radix, the journal Spencer founded, publishes articles with titles like “Why I Am a Pagan.” One essay notes that “critics of Christianity on the Alternative Right usually blame it for its universalism.”
Secularization is transforming the left, too. In 1990, according to PRRI, slightly more than half of white liberals seldom or never attended religious services. Today the proportion is 73 percent. And if conservative nonattenders fueled Trump’s revolt inside the GOP, liberal nonattenders fueled Bernie Sanders’s insurgency against Hillary Clinton: While white Democrats who went to religious services at least once a week backed Clinton by 26 points, according to an April 2016 PRRI survey, white Democrats who rarely attended services backed Sanders by 13 points.