Are you discounting the last verse of chapter 4 as being inaccurate? I don't understand the reasons you give for not including that last verse as part of Genesis.
ICANT, iirc, hold the chronological order of Genesis to be this:
Gen 1:1 = the day god created the heavens and earth.
Within that one day, you have Gen 2:4, which happens during the day god created the earth, through the end of Gen 4 all happening within Gen 1:1.
Then, you have Gen 5 and forward happening just before Gen 1:2, with The Flud resulting in the formless void that is described in that verse.
Its a type of Gap Theory -- look it up on wiki
"Adam" can mean just "mankind" rather than an individual person. And there's the part about stuff happening "in the day" god created the earth.
The probelm is, that at the end of Gen 4, those last two verses, Adam gives birth to Seth who gives birth to Enoch. And at the begining of Gen 5, we have Adam giving birth to Seth who gives birth to Enoch. But according to his timeline, those are two unrelated groups of people because those in Gen 5 all die off before the earth becomes formless and void because of the flood as recorded in Gen 1:2. Then there's a whole new group of mankind. ICANT writes this off as a coincidence: i.e. there were enough people with those names that they don't have to referring to the exact same people.
Its pretty much the nail in the coffin of his whole explanation, so now he just doesn't include those last two versus as being a part of Chapter 4.
Edited by Catholic Scientist, : No reason given.