I see this in the way that sermons are preached. How would you give a Black Nationalist speech or campaign for the Republicans when you're an integrated congregation? It doesn't happen.

It's one of the things we find in these congregations is that they are much more likely to be sort of up-beat worship styles, more likely that people in these congregations say "Amen," maybe get up and dance some, tend to be a little bit more lively than a typical white service would be, but not as lively as a typical black service would be.

We go where our family goes. We go where our friends are, and because our social networks are so segregated by race, we end up with what we have. We also find that, you know, if you're immigrants, you're not part of that history.

If you move here from somewhere else, I often think if I move to Germany, for example, or if I move China and I go worship there I will understand and I'll be willing to give up a lot of my culture because I'm in somebody else's homeland. So I'm going to have to act German or Chinese, whatever that might mean.

I spent a lot of time developing in books why worshipping separately actually impacts inequality, economic, social, on and on. So I really do believe there are huge advantages to being together even though it's difficult, even though we have a lot to learn.

What's happening is that Asian and Latino and other groups without that history are more likely to end up in either black churches or white churches and then make them multiracial churches. I talk about that in the US we have two cultures.

What sort of difficulties would happen when people of different cultures try to come together to worship? Tiny little things such as let's tell jokes with each other.