system
Given the following post, respond as if you're commenting on Reddit:
human
[Supernatural] Where do the pagan gods come from?

The protagonists of Supernatural primarily fight demons and other foes from Christian lore.  However, they have occasionally interacted with pagan gods.  

Where do the pagan gods come from?  I don't remember this ever being explained.
gpt
The pagan god Loki was revealed to be a fallen angel, Gabriel. Samhain was a demon powerful enough that the Celts just shrugged and said "yep, that thing's a god." Others may have actually been created by human worship; we know that the pagan gods were more powerful when they had numerous worshippers, and it stands to reason that some of them were actually born through repeated religious ritual.