As Mr. Costanza and Mr. Ross are arguing about "going in fresh" to Firestorm, George mutters under his breath "Oh Mother of God!" - a peculiar thing for a Jewish boy to say.
George isn't Jewish! Jerry is! George is Christian. Anyone remember Festivus. Jerry says Frank created the holiday as an alternative to CHRISTMAS. No telling what George is now, but it seems he was raised, for a while anyway, as a Christian.