The financial and mercantile district churches are fabulously well-off. The countryside is more white in the north, more black in the south, but everywhere the people stay pretty separate on Sunday morning. This is also true, incidentally, the rest of the week. Todays polarizations are along the lines of white and black, Western and Third world, majority and minority. These polarizations are real.
Racial tensions are real.
The races don't really get along in our world. And the state of Christian Churches in America tells us that this is true even in the Churches. Theologically, the issue of race is dead for them. But in every other way, even worship, it is very much alive. You cannot erase that fact with good will.