The decline of institutional Christianity over the last 40 or 50 years has empowered a side of American religion that has always been there. The sort of do-it-yourself, "create your own Jesus" kind of faith. But, the forms that faith takes do have a real reason they are so appealing.

I think it is very clear that, though great difference remained, evangelicals moved closer to Catholics, mainline Protestants and evangelical Protestants moved closer together, and this convergence coincided with greater institutional strength for all the Christian churches than, for the most part, you see today.

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.

My mother converted when I was 16. She was the driving force behind religion in our family. So, I'm sure I was heavily influenced by that. But, I also was, and still am, convinced by the Catholic churches historical claims to represent the continuity with the early Church that other forms of Western Christianity lack.

Our culture has few taboos that can't be violated, and our establishment has largely given up on setting standards in the first place. Except where Islam is concerned. There, the standards are established under threat of violence, and accepted out of a mix of self-preservation and self-loathing. This is what decadence looks like: a frantic coarseness that "bravely" trashes its own values and traditions, and then knuckles under swiftly to totalitarianism and brute force.

Independent of the critique I'm making, I'm just trying to paint a more comprehensive portrait of American religion than you get from a right versus left, religious conservatives versus secular liberal, believer versus atheist, binary. Too often, we just look at religion in America through that kind of either/or lens. I think it's much more complicated than that.

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.