Ah, that explains it. That's your area of expertise then.
Asian religious/myths are something I'm looking at, and I find similarities really; the "ancestor worship" is actually global. Our ancestors - humans - revered and respected their anticedants. Afterall it was they who bore them, fed them, protected them and taught them. If you look at the archeology from even the middle east, there is evidence of this respect in the bits of statuary, as well as the burial items. It's a bit of a stretch, as we're also trying to impose our world view on these ancient sites but it certainly seemed similar to me ... ^^ Egyptians, not the pharoah, but everyday people, reverred their ancestors as well; I don't think as diety, but out of respect in some way. It doesn't take long for something like that to grow into a religion.
When I was studying Egyptology back in college (this was 30 years ago!) I remember the information given was that the Pharoah was marrying his sister because SHE held the reigns of power. SHE was the Land, and so for the man to gain the power to rule, he had to Marry the Land, aka sister, cousin whatever. This I later saw in Celtic and European myths, which were even reflected in books like Morte D'arthur.
As for Native American, I leanred what I know from sitting around the fire; I listen and try to make sense of what I hear. I never lived on the Res... that was my grandparents thanks. ... so I didn't hear this stuff in a religious perspective. What I know is from experience though, and having dealings with Shamans. I came away with a bit of an understanding that they are trying to be the intermediary I guess we would say. They are trying to catch the power of the moving force of the universe to heal, or direct or ... whatever. (Not a shaman, can you tell)
But the whole time I listened to these folks talking to me, the more I realized that the similarities are there, between the older, ne - ancient, prehistorical even! european "myths" and the natives. I saw similarities in Asia too. We humans like to explain things and since we don't always have the words, or the knowledge, we try some other fasion. (boy that's sensible, hope that makes sense to you!)
Goofy example here. I used to travel to Berkeley California several times a year. Parking is absolute hell. The locals used to say, if you want to find a parking spot, then you need to pray to ... (I can't remember the name), the new god of parking meters. Now I thought they were kidding, but as I observed, if they did a prayer to this diety, they had a better shot of finding a parking spot than when they didn't. Now yes, that could be coincidence, but it runs in the same league as finding a parking spot in downtown New York ... aka, a cold day in hell! Yet they found spots... every time. An example of the birth of a myth. I haven't been back for a while, but I wonder how many people still "pray to this parking spot god" without knowing its origins; and also, if the "god" has become a reality because the minds and wills of the people doing the praying "made him so".
Ok, enough outta me.