What to do about my roommate?

honestly, i dont really know where to start. first of all he's probably the biggest bible thumper i ever met and im atheist, and everytime i try to play a song on youtube or whatever he takes it, redoes the lyrics to something that he knows will piss me off and i dont know what to do about him. day in and day out i just wanna knock him the f**** out, but i aint gettin in trouble for that