Jesus vs Frosty (and Santa)

Was this Matt & Trey's first animation? It was weird seeing Cartman as Kenny.

I was also curious about the footage in the opening sequence that shows Santa spinning Jesus over his head. Is this from another one of their animated shorts?

That was from their short movie "The Spirt of Christmas". If you(or someone you know) has Tiger Woods Golf for the playstation, and you put that disc into your computer you can open that with Windows Media Player, its a hidden file on the disc. So that might be worth a trip to Blockbuster or your local video store.