Rob told in an convention that Kripke told him that Chuck was God, and he was like ohh umm okayy 😆
Reminds me how actors auditioned for something, and landed up doing something. I remember Richard telling that he auctioned for playing a janitor , which turned into a trickster and ultimately Gabriel 🤣 Even Jensen autioned for Sam at first 😆
Anyway, I got sidetrack there.
But Chuck being God, is no where in the canon. Its basically what fans thought he was, cause obviously he is not a normal prophet [ err as much normal a prophet can be] . In fan fiction he was there to represent Eric, who is basically the creator of supernatural ,giving his approval to the fandom.
Personally I like the whole mystery around Chuck's character in the canon , and like it to stay that way.