There is a strain of apocalyptic (in terms of battles between Good and Evil and possibly an end-of-times blow out) in Judaism, which survives in the Book of Daniel and in kabbalah, but it's not really part of the main tradition of the religion. It's been played down in recent millenia, unless times are REALLY bad. So it's something I suspect only scholars of the subject would know about. And I don't see the producers of SPN as any sort of scholars. (Although I'm sure that's the origin of the Christian beliefs.)

I avoided watching the Christmas episode, but from the posts I read, I gathered that the non-Christian gods were presented in a very bad light, as they have done in the past.

I have to say, I regard most horror universes as essentially Christian in nature - other than the Golem (itself originating in an early 19th/late 18th C fantasy story), there are few horror tropes in Judaism.