Lots of claims, no evidence.
You are ignoring the tools that where made before then, the hunting and hurding. The gathering and the organization of tribes for that. In short, you are picking one development, claiming it is not possible for the humans of the era to discover it without outside help, and ignoring all the other developments they would have had, but dont know much about because they didn't settle in one spot for long.
The first Humans were made on another world, a world which was underwater. Genesis 1:6-7 They had farming, city building, smelting and the traits of modern Humans. Genesis 4:17-22 describes a modern world and NOT people who live in Caves. It's the difference between the sons of God (prehistoric people) and Humans, who are the descendants of Adam.
Also, you can claim there was no humans if Noah's sons married woman. If they where from another dimension, I would be amazed that they are similar enough to breed, much less breath our air and eat our food.
You are making a big claim on scant evidence.
The evidence can be found in the chromosome 2 fusion. The oldest archaic group of Humans (Noah's descendants) married and produced children with the prehistoric people who had been on Earth for some 6 Million years AFTER they had diverged from Chimps.
This younger species (sons of God) married the grandsons of Noah (Humans) and produced the modern Humans we find today. That's God's Truth Scripturally, scientifically, historically, genetically and mathematically. Amen?
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