Herm, for the lady who likes Elvis ... Third Day may be more comfortable than Skillet or Red.
People hear the singing guitars, which in metal music is just as much of a lead voice as the singer, and get confused I think. There's too much room for "interpretation", sounds too much like commonly heard "devil music" -- like Nickleback, and is "too loud".
There's a song by Disciple called "Hypnotized" and the bridge gets real quiet and then builds then the guitars rip out to wake you up. Love it.
Also, I have found it useful around my nephews/niece ... they play me Nickleback, I play them Skillet. She played some Lady Gaga, I played her some Lacrae. To show the younger generation (they're 12, 12, and 14) that there's "cool" music that is healthier than some of the, er, choices out there today.