It is pretty clear that the early chapters of Genesis reset the time frame. I'm OK with that, though it sounds a lot like the work of two different authors (particularly with the 2 different creation tales), but.. that's fine. I'm generally OK with a "previously on earth" if you will...Just because Genesis 5 comes after Genesis 4 in the book does not mean those events had to happen in the same order. Genesis 4 is Cain & Abel's story, while Genesis 5 is sort of a recap for the purpose of establishing the lineage of the Adam-Noah line (which then continues into Noah's story). For as long as these lives are supposed to have lasted, it's not unreasonable to think that Cain had his own children well into his 100's (his age is not specified), and it's actually not hard to imagine that he could have "married" even a later descendant from Adam's "other sons and daughters", so not actually his "sister" but potentially a niece etc. For as long as these lives in Genesis lasted, there could be dozens or hundreds of people (and overlapping generations) in just a few centuries.
Still, I think we are agreed that it is less than clear what's going on and how this is all supposed to make a lick of sense. Consequently, we are forced to make assumptions and conclusions.
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