I may have to shop with them. But on Sunday I don't want to have to worship with them. I want to be able to just be myself and let my hair down." It's also, of course, as we know, the seat of political organization and the affirming of your blackness and so on.

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.

So we didn't get the denominations and the separate congregations really till about into Civil War time. What's happened then, of course, is now that we've had well over 100 years of this history to establish separate cultures, different ways of worshipping, and different ways of understanding theology so that when people try to come together makes it very difficult. And then, of course, social networks, you know, how do we find a place to worship?

So they actually put it into their mission statement, and they start changing things as a result. They may change how worship works. They may actively recruit folks and try and get them to come and help them to feel comfortable and get them involved in leadership, and there's a variety of ways.

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.

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.

We studied a mosque, and this is when we were at Notre Dame, and in this mosque they had people from a variety of countries, most of them immigrants. In some of the countries, when you go into a mosque you remove your shoes. To not do so could be punishable even by death in that nation. In other countries, it would be a great offense to remove their shoes when they come into the mosque, a sign of disrespect.