There is an interesting article in the July issue of Crisis Magazine (from the NAACP) about the rise of black mega-churches. [Not online]
Many are affiliated with Word of Faith International Christian Center run by Keith Butler.
The conflict is between these new churches which preach a prosperity based theme and the traditional black churches which focus on helping the weak though promoting social change and improved equality. Interestingly, the members of the mega-churches still trend Democrat unlike similar demographics in white churches.
Perhaps someone better versed in the issues would like to discuss this?