There's always the question of time. Does time at 10:00 mean 10:00 sharp? Or does it mean give or take a few minutes? And a few minutes, is that plus or minus two minutes? Or plus or minus ten, or maybe a half an hour each way?

What happens is sometimes these congregations will still have the white style of worship, even though they're mixed, because folks are willing to give up whatever they may have come with. So it's still quite a stretch for African Americans, yeah.

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.

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.

I never meet a church that wishes they didn't do it. I never meet a leader that wishes they didn't do it. They will all say, to the person, it's hard. It's difficult. It comes with complexities and confusion as you're trying to go across cultures, and you don't understand, you didn't mean to offend somebody but you've offended somebody. But they will all say it just does something.

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.

If we go into white congregations, non-whites will sometimes say it felt like worship never started. It was sort of dead and didn't feel that warmly received. But so - and there are different realities either way, and it makes it difficult for all groups to try and cross boundaries.