There's a lot of terminology, like "washes whiter than snow," and these things which when they're said in a uniracial congregation, they just go fine. But when they're said in a mixed congregation, some people will get offended and wonder, "Why are you saying that? What are you saying?"

I think it's easier, I really do, because of not having that similar history, so that's why I think two-thirds of these mixed congregations are either white with Asian and Hispanic, or black with Asian and Hispanic.

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.

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?

We've done a lot of studies to see when they do happen, why, and I mean there's a variety of reasons. But one, it starts with a commitment where they decide this is going to be who we are. Maybe it's out of their faith, a new way of looking at their faith, that we must be integrated across race.

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.

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?