I'm not embarrassed by any of the music I like or have liked except: Green Day. They suck so god damn bad, and plagiarize way too much, but they used to be awesome to me, and some of their older stuff is still so damn catchy!
Don't be embarrassed dude, though I can identify as being atheist and singing along with Jesus tunes definitely brings up odd feelings of dissociation, Christmas music is fucking awesome - we can't let the middle-aged women have it all to themselves.
I am happy to say I don't know of most of these bands. I know of one nickleback song, and that their tour manager was a guy named prater (cool dude) also, their pyro guy was cool, don't know fuckall about the band. I'm a bit ashamed to admit I once was all about 1950's am pop.