Problems with race

So far, the representations of gender in the show are pretty sophisticated, I was impressed in that respect. I'm much less impressed with their treatment of race. In particular, why are all the most religious characters black? I'm delving a little into the beginning of season two here, but there's Roslin's (spiritual?) adviser (the one who realizes the importance of the 12 serpents), her guard in the brig, and the quorum member from Gemenon. It makes me a little uncomfortable...