I’m a bit unsure, even now, whether or not I’m approaching this issue with the right mindset, but I am in the same boat, albeit a more serious one. I have been a fan of several openly anti-Christian bands for several years, namely Dimmu Borgir and Behemoth. Their lyrics (when I ever care to glance at them) are offensive and blasphemous, but their styles of music and sound are unique, in my experience at least. I find the genre of symphonic black metal to be immensely appealing with regard to its style and sound - the synthesis of heavy metal with orchestral arrangements is one of my favorite kinds of music, alongside (odd, I know) Frank Martin (and various other classical composers) and Frank Sinatra.
Perhaps my reasoning here is faulty, and perhaps someone may point it out to me, but what I do when I listen to the music is kind of tune out the words, when they happen to be intelligible (which is not very often, let me tell you, given the way these folks “sing”). When I do understand the words, I often think of what they are contradicting in terms of my faith and run through my head the reasons for why I believe in that particular doctrine that the band is denying or ridiculing. An important part of this approach for me is that the lyrics which I have seen by these bands are, to be frank, incredibly shallow and insubstantial with regard to real meaning or value. They are obviously trying very hard to sound evil, to project a specific image of themselves to the listener, and in my case, I find their position rather sad and pathetic. They never really give reasons for why they say these things: they just say them, and that tells me that they want attention. I often laugh when I hear certain parts of songs because of the ridiculousness of a line, the utter ignorance of it. As you may have guessed, when it comes to music of this genre (metal, and rock in general), I listen solely for the sound of the music and pay no attention to the lyrics.
That’s my take on it, anyway. I’ve never heard of those bands you mentioned, but I imagined that the principle was the same, essentially.