Christian pop is usually only known and promoted in Christian circles. Harder-edged Christian rock (i.e. P.O.D., Skillet, Demon Hunter, etc.) has lots of following and appreciation among secular fans as well as Christian fans. Some of those bands are really good musically. I personally find Christian pop to be too feminized, with little appeal to male audiences; you know, the so-called “Jesus is my boyfriend” music. I would rather just listen to Air Supply than most of that stuff.
I don’t listen to much Christian music, but I think Ashley Cleveland can belt it out pretty well, and I think Miriam Webster has a real bluesy voice. A few years ago I bought a couple of Hillsong albums and thought they were pretty good - kind of a wall-of-sound, cast of thousands approach. At that time, Miriam Webster was with Hillsong. I think Darlene Zszech (sp?) of Hillsong was very good