The evangelical movement flourished in this relatively anti-institutional country at a particularly anti-institutional time. Evangelical ministries and churches fit the “spirit of the age,” growing rapidly in the 1970s, and retaining more of their members even as many mainline denominations declined.

At the same time, Keller argues, that anti-institutional tendency makes evangelical communities more prone than others to “insider abuse”—corruption committed by leaders who have almost no guardrails—and “outsider-ism,” in which evangelicals simply refuse to let their church form them or their beliefs. As a result, they are unrooted—and therefore susceptible to political idolization, fanatical ideas, and conspiracy theories.

“What we’re seeing is massive discipleship failure caused by massive catechesis failure,” James Ernest, the vice president and editor in chief at Eerdmans, a publisher of religious books, told me. Ernest was one of several figures I spoke with who pointed to catechism, the process of instructing and informing people through teaching, as the source of the problem. “The evangelical Church in the U.S. over the last five decades has failed to form its adherents into disciples. So there is a great hollowness. All that was needed to cause the implosion that we have seen was a sufficiently provocative stimulus. And that stimulus came.”

“Culture catechizes,” Alan Jacobs, a distinguished professor of humanities in the honors program at Baylor University, told me. Culture teaches us what matters and what views we should take about what matters. Our current political culture, Jacobs argued, has multiple technologies and platforms for catechizing—television, radio, Facebook, Twitter, and podcasts among them. People who want to be connected to their political tribe—the people they think are like them, the people they think are on their side—subject themselves to its catechesis all day long, every single day, hour after hour after hour.

On the flip side, many churches aren’t interested in catechesis at all. They focus instead on entertainment, because entertainment is what keeps people in their seats and coins in the offering plate. But as Jacobs points out, even those pastors who really are committed to catechesis get to spend, on average, less than an hour a week teaching their people. Sermons are short. Only some churchgoers attend adult-education classes, and even fewer attend Bible study and small groups. Cable news, however, is always on. “So if people are getting one kind of catechesis for half an hour per week,” Jacobs asked, “and another for dozens of hours per week, which one do you think will win out?” //

But when people’s values are shaped by the media they consume, rather than by their religious leaders and communities, that has consequences. “What all those media want is engagement, and engagement is most reliably driven by anger and hatred,” Jacobs argued. “They make bank when we hate each other. And so that hatred migrates into the Church, which doesn’t have the resources to resist it. The real miracle here is that even so, in the mercy of God, many people do find their way to places of real love of God and neighbor.” //

He’s heard of many congregants leaving their church because it didn’t match their politics, he told me, but has never once heard of someone changing their politics because it didn’t match their church’s teaching. He often tells his congregation that if the Bible doesn’t challenge your politics at least occasionally, you’re not really paying attention to the Hebrew scriptures or the New Testament. The reality, however, is that a lot of people, especially in this era, will leave a church if their political views are ever challenged, even around the edges.