There are other threads on the topic of who were the “sons of god”, who were the watchers of Enoch, and why is there no indication of a bottle neck in the genetic code indicated by the story of Noah and the Flood. The only alien mentioned in the Bible is human’s adversary, so no such thing as friendly aliens. Those humans created on day 6 had full knowledge of how the solar system works as they were in counsel with God on a wide variety of topics related to life in the universe. I am surprised that those who do not consider the Flood to be such a life changing event cannot help, but wonder how humans came to be in the stone age to begin with. Other than the notion that the Bible is wrong and humans were never advanced and had way more information before Noah, because there is no technology left behind indicating that they were more capable than we are. They did not need technology. That is only neccessary for those bound in the physical aspect of reality. Is there an unseen dimension where technology more advanced than ours thrives around us?
God gave the book of Genesis to Moses more than likely thousands of years after the Flood, on faith with nothing to varify it’s truth. Moses was royalty educted in the full knowledge the Egyptians had at the time. Perhaps it was not a total blind faith to Moses, and there was probably more proof given to Moses by God that was never put into the record. The Mesopotamians and Sumerians before them only had oral traditions handed down to them.