Christian Music?

I was thinking more in terms of transferable guitar skills and techniques.

As for "objectionalble lyrics", that's subjective.

I will look up those singers, though (I'm always happy to check out performers I've not heard before).

Nice! Look up the song, Let Your Glory Shine by Lincoln Brewster. Also check out GT's excellent lessons on Jason Aldean, My Kinda Party and Tim McGraw, All I Want Is A Life.