Im not sure what you mean but there is an obvious relation… (I feel like that episode of seinfield “should we be talking about this?”) Per capita there are more or less catholics with certain skin colors. Chinese would be a different percentage than hispanic, Middle eastern than Italian. Perhaps you were taking the ever so popular " I am color blind" route but that isn’t realistic in this conversation.
This original post had something to do with American ethnicity rather than african. So the question can be looked at as a racial thing but answered quit best when looked at in the light of race religion in the history of our nation. If one does not understand the south, the north, slavery and what role religion played in the lives of african american history then the context is lost.