While I don't really think you're wrong, the fact I came to understand most of these concepts myself independently first through dissociative and psychedelic experiences prior to to really studying or understanding any of these esoteric belief systems suggests to me Carl Jung was pretty on the mark when describing all this as emerging as a result of something more fundamental to all human beings in the structure of our nervous systems/biology, belief systems, and cultures. Something more essential to the nature of ourselves as conscious beings seems to be behind the manifestation of these same recurrent concepts across all cultures in all geological locations across the world.

I may be talking out of my ass here, but I'm sure Native American legends and belief systems, among others, not directly connected in any way by trade routes or any other form of cultural bridge likely contain the same basic concepts.