We've had people say, "Now when I go to work, I don't feel uncomfortable talking to people of different races, and I go up and introduce myself, and I start making a new friend I wouldn't have done otherwise."

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?

I see it happen in uniracial congregations all the time. But people - when they're in mixed company, we speak differently.

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.

Preaching styles and people being slain in the spirit and things like that. Now it doesn't happen in all black churches, and it happens sometimes in white churches, right? But on average they're quite a bit different.

I think with President Obama there's going to be a discussion, because he himself is multiracial, because we have for the first time a non-white president. There's going to be talk about what does this mean? What is it? Are we in a new era?

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.