Every civilisation has their version of what happened orinally, but you know what, all their versions (all their religions) are exactly the same in all the main principles and characters of their Gods, except the Biblical Creators, who are actually violently against these ancient religions honouring the Solar Deity, Planetary and Astral deities! It is quite reliable, all you need to do is to see how they are the same, (all in the same vital doctrines) and how they are different.

Each country will have differnt names, (some hugely different, some quite similar for the personages of their Godheads and deities)

but this is not a problem, since the main attributes are always the same, at the foundation.