As Salamu 'Alaykum,
There is no longer a legislative segregation of races in churches; however, many denominations had a history of segregation and have continued the tradition. The United Pentecostal Church was originally for all intents and purposes a segregated denomination. The Church of Jesus Christ was a African American denomination that held the same theology as The United Pentecostal Church. The Church of Jesus Christ was often considered by many to be the "black sister church" of The United Pentecostal. This division by race still continues in many denominations.
Also, just as outsiders see The Nation of Islam as being the African American Islam; the same is the case of churches teaching Christianity and Racial Nationalism. This theology nearly cost President Obama the election when the media turned the spotlight on the pastor of the church which President Obama and his family attended.
Although it is anathema to make racial remarks in public and practically economic suicide for public figures to even suggested that their is a diversity between races, even educated Americans use words that carry a subliminal racial message. And, some Scholars have pointed out that educate people will often change their syntax based on the race of which the person to whom they are speaking is of a different race then themselves.
When I was a preacher I was occasionally invited to preach at one of the "Black Churches." I enjoy the free style worship of Pentecostal Churches which was greatly influenced by Native African Religions. I have also witnessed personally entire churches that were normally very friendly to visitors become very distancing to Black Families who visited these churches.
However, in all fairness,apparent racial segregation within many churches is simply a byproduct of the surrounding neighborhood. Neighborhoods are still often segregate by economic factors and Nation Heritage so consequently the neighborhood church often reflects that segregation without holding racist views.
