Pretty much anything by Bad Religion. At the moment, their songs “Faith Alone” and “God Song” come to mind; actually, that whole album, Against the Grain, is full of wonderfully blasphemous lyrics.
I’ve heard of a group called Deicide that is supposed to be quite non-belief—well, anti-belief. Actually, anti-christian. Looking at some of their lyrics, I wonder if they’re Satanists, or just playing off of that theme? http://lyrics.rockmagic.net/lyrics/deicide/