What you are saying is that Christian music needs to be less Christian in order not to [vulgar reference] and sound more like “mainstream” or “worldly” music.
There is a hypersanitized version of "SWPL" Christian music. There are ways to convey Christian thought in music, without beating the user over the head with it. (The lead vocalist / musical driver for Transatlantic, Neal Morse, is a pretty outspoken Christian: one of his albums is entitled Sola Scriptura -- and, come to think of it, he converted after moving from L.A. to Nashville. Which partly argues against my thesis, come to think of it. ;-) )
Try looking up his live concert Neal Morse: Testimony Live: One of the songs deals with how his infant daughter was healed of a physical hole in her heart after prayer...but that's several hours INTO the concert.
Cheers!