I believe this to be a mystery.
There’s a lot more information to research, fossils all around the world, considering today’s world… rather than the world of the past [like in medieval times or in times of antiquity]… or at least, I think.
Some people trust most scientists. I don’t trust them as much as long as they can’t make a human from the supposed physical source of Humanity… as long as there is no replication of the process… it’s just speculations. Now speculations can be advanced, or not. Speculations at an advanced level are less speculatory and more grounded in factuality.
My only thoughts about this is, I should do my own research and there isn’t too many replication of the theories about the creation of man, in an evolutionary perspective, based on my knowledge.
I know it would be hard to replicate, but it can only be hard, as it is a difficult question. The response to it is not to believe in the most trusted speculation from most scientists, but to wait for the replications. That’s my epistemological take on it, however… to each his own.
As for the stories of other civilizations…? I think many things like Demiurges, Annunaki could be interpreted as things beyond the physical, and perhaps referring to physically transcendental principles, principles beyond the physical, while having roots in the physical… it could be allegories about creation but not in the way we might think of it, as in : X physical being [in the way we conceptualize physicality as in, body occupying space and possessing weight] creating X physical being…
but more like A concept embodying B transcendental principle, extrapolated from physical world, creating Y physical being.
Think about the association of sun Gods with justice, knowledge… does it mean gods are physically made of the Solar material, or perhaps it’s referring to the security we gain from the sun [as opposed to the darkness, where many things can crept therein] and using this to articulate the security we gain with whatever rules over justice and knowledge?
As in… the best way we can relate to the God of Justice, is through the Sun.
Perhaps…? I am not sure. I am just speculating, and taking a pictoral representation to ancient concepts.
Could it be the same with the creation of Mankind? I don’t know.
You asked for thoughts. I provided mine. I am not an expert.
Hope it was a little bit useful.