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.

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.

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.

But in the US, when you have two separate cultures, each with its right, each of which has come to exist in this political entity in the last couple hundred years, each feeling like, "I have the right to hold onto my culture," and that's what makes it difficult.

If you move here from somewhere else, I often think if I move to Germany, for example, or if I move China and I go worship there I will understand and I'll be willing to give up a lot of my culture because I'm in somebody else's homeland. So I'm going to have to act German or Chinese, whatever that might mean.

Now they had to sit in separate places and sometimes they'd even have to sit outside and look through the windows. But they did worship together.