And different traditions stress different - so then there's that. I talked to an African American who says before she goes into an interracial church, she sits in her car and she listens to gospel music to get her fill, and she goes into an interracial church where they don't do gospel music, and she's ready to accept the other sorts of ways of worshipping. So there's that.

Then of course there are bigger things that matter, like who do I see up there in the congregation? Do I see myself up there? Well, I don't.

So you find a lot of these sixth Americans congregate in these interracial congregations. They hang out together at work, at school, wherever.

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.

Once in a while you get people that maybe because of economic reasons, or have a social network, they get attracted. But it's a very tiny percent so that when we look at, you know, who are pastors and who are the head clergy of these congregations, they're overwhelmingly white, just a few African Americans, and those folks are usually called to what were formerly white congregations, or they started interracial church from the get-go.

Humor is so culturally based that when I try to tell a joke as me being a white American, if I tell other white Americans, they'll laugh. If I tell an African American, they might not laugh. In fact, they either might not find it funny, or they might find it offensive, and I didn't mean it to be offensive. So these are the sort of little things that build up over time, just like in a marriage. You know, the little things can build up over time.

I meet almost no one that goes to an African-American church or thinks, "I'm going to do that." Now there are whites in African-American churches. They're interracially married. They're highly committed. Maybe there's a professor or two, or a student.