I’m sorry, but what are you implying in this post? It sounds as though you are saying that Af-Americans are more interested in politics than God…in which case I would have to disagree… however, before I give a full reply to it, I would like to be sure that I am reading correctly.
As for why there aren’t a lot of Af-American Catholics, it seems to me that it’s a combination of tradition and generally how services are conducted. To the tradition aspect, ask yourself why a majority of Latinos, Italians or Filipinos ‘shun’ the protestant faiths. As much as it would please us to say that they understand the fullness of Catholic Faith, the truth is that most of them are Catholic because they were raised that way…it’s their culture. The same is said for a lot of Af-Americans.
A better question would be, ‘why aren’t conversion rates high for Af-Americans’? For that, I think it’s because there are a number of stigmas attached with becoming Catholic. One, because rumour has it that Catholic services are quiet, ‘boring’ things, lacking in any kind of flavor. The heart of a lot of Black Religious belief is that you give glory to God in any way that you can… sing, shout, etc. Without these elements, a lot of Black Protestants tend to equate quiet with a spiritually dead church. Combine that with deeply-ingrained protestant indoctrination (‘Catholics aren’t Christian,’ ‘They worship Statues,’ and other Jack Chick-inspired thoughts!)…
Another stigma is the belief that Catholicism is a ‘white man’s’ religion…and to that I’ll admit that I thought it as well (we’ve seen some threads started here on CAF that speak to that from other users). And, well, it’s largely true in the United States. Historically it makes sense, as a lot of white people that settled in the US from Europe were protestants AND had slaves… and since most slaves ended up with the religion of their ‘masters…’

I suspect that’s why there are a higher than average number of black Catholics in New Orleans, Louisiana, Baltimore, etc.
Then there’s that whole Confession thing…
There was another reason I’ve thought of, but I’m not sure of how to phrase it yet so I’ll set it aside for now.