I think the point that he's trying to make is that you cant just say something is satanic just because it isn't religiouse or mentioned in the bible. The fact that he happens not to believe in satan is beside the point.
Music's a good example. Who do so many christians ONLY listen to christian music!? Looking beyond the fact that it's religiouse... and surveying it with the same level of cynisism with which i survey everything else... it tends to be down right aweful. Even if i was christian i wouldn't actually listen to that. I'd still like Queens of The Stone Age, Muse, Metallica, The Offspring etc. Simply because they are good (and i do have quite excellent taste you know 8) ). 'Non-biblical... GAH! *twitch twitch* NO! SATAN!!' kind of a steryotype but it's true. Just because it aint biblical, it doesn't make it 'SATAN!!!'.