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.

Every Christian in every time and place is going to be tempted by certain forms of heresy. I'm sure I'm tempted by my own.

No one doubts that pure libertarianism is simple, but that's just why it remains on the ideological fringe - because it boils down the most difficult questions in human affairs to a simple equation, a What Would the Market Do bumper sticker.

One of the things I try to do is take seriously some of the forms of American religion that people consider to be shallow and try and figure out why they have such a strong appeal and tease out the theology they actually represent.

You start reading C.S. Lewis, then you’re reading G.K. Chesterton, then you’re a Catholic.

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.

The idea of universal human rights may not seem as weird to some people as the idea of a personal God, but it is still a metaphysical idea that liberalism, at least as we know it, couldn't really survive without.