It's clearly the case that there's not some moment in American history when every evangelical is holding hands with every Catholic who is holding hands with every mainline Methodist, or what have you. Obviously, American Christianity was deeply divided in all kinds of ways at mid-century too. But there was a kind of convergence going on. Even though Reinhold Niebuhr, the great mainline Protestant theologian, didn't think highly of Billy Graham, he and Graham still, clearly, had more in common, both theologically and in their attitudes toward religion in public life.

It's not always clear where a healthy patriotism shades into a dangerous nationalism.

I do think you can see, throughout American history, this temptation, and it's both a liberal and a conservative temptation, to take a healthy patriotism a little too far. For liberals the temptation is to say the purpose of politics is to straightforwardly bring the kingdom of God to Earth. For conservatives, I talk about Glenn Beck, the temptation is more apocalyptic and messianic, it's the temptation to say we did have a covenant with God, a literal covenant beginning with the Founding, and we are, like Israel in the Old Testament, falling away from it.

Every young writer, I imagine, has their first intellectual magazine, whose essays and articles are devoured all the more greedily for being slightly over one's head. Mine was First Things.

Institutional Christianity has had clear secular benefits to American life for hundreds of years. It's played both a prophetic role in terms of generating moral critiques of American excesses, and so on, and also a communal role, in terms of building community as the country moved westward to the role my own Catholic Church played in assimilating generations of immigrants.

It's just silly to look at the incredibly steep decline in the mainline and the clear institutional weakening of Catholicism in the 1960s and 70s and pretend that something really big didn't change then. It did change. There really was a significant institutional decline.

The fact that institutional churches have gone into decline doesn't mean that we're going to enter some purely secular age. Secular people need to be aware of that.