Don't knock Christian Hiphop if you haven't really heard it. It's way better than the T-Pain & Lil' Wayne type stuff out there. Think "backpack" hiphop (if you even know the term). Some of the "Holy Hip Hop" sounds more like The Roots & Common.
The new "91.9 The Call" in Fort Myers is one of the best Christian stations that I've heard, playing everything from rock, dance, & hiphop. Whoever does their station audio imaging is a genius.
KJ-52 is actually known as the Eminem of Christian Hiphop. He raps about being a Floridian & soccer moms driving in minivans. It's humorous, yet real. I have all of his CD's. He's skewed a little Electro in his most recent releases. I've received a few calls every time after I play a KJ-52 track. People love it!
Cross Movement, John Reuben, & DJ Maj are well-known Christian Hiphop artists. Toby Mac & DC Talk might ring a bell. P.O.D. & Switchfoot is played on Christian Rock stations.
I'm not even a Christian! Only open-minded people listen to the left side of the dial. (87.5-91.9) The extremely open-minded participate in it voluntarily, like myself. Knowing & interacting with your audience & having guts - That's the beauty of radio that most stations today lack.
To me, there are really no rules in radio as long as I read the PSA's, play promos & spots, do legal ID's, & do what the FCC requires, which really isn't all that much. The rest of the airtime is all "DJ Mo", guts & all the fun included!