Ok. we all know the theories about how christianity is bee es cause concepts like jesus being the son of god, various holidays and stories in the the bible and more, lots more, having origins in egyptian beliefs.
Theories? More like speculative crap lol
Theories can be falsified.
You can't travel a lineage in the past.
There can be no theory in regard to a belief systems origin.
Simply because, there is no way to actually test if that is the case.
If the occurances were only apparently similar and not linked, you don't have the people who organized the stories these beliefs are based on to ask.
So you have absolutely no idea where these stories came from. We can assume shit, but let's not glorify those assumptions as theoretical, they aren't.
Anthropology is not a science, it's speculative garbage.