Henotheism in the Hebrew Bible.

[BrianSoddingBoru4]

‘Generations’ is not the same as ‘genealogy’. The former is who is descended from you, the latter is who you’re descended from (if it was Adam’s genealogy, it would simply read ‘God’).

It’s intended to show Noah’s descent from Adam, through Seth. Since Cain wasn’t Noah’s direct ancestor, it wouldn’t make sense to mention Cain. Nothing to do with snake DNA.

Boru

So now were attempting to argue semantics?
https://www.biblestudytools.com/dictionary/genealogy/

Genealogy. [N]

In Hebrew the term for genealogy or pedigree is "the book of the generations;"

The 'generations' of Noah mentions ALL of his sons, and the 'generations' of Noah son mentions ALL of their sons, yet the 'generations' of Adam leave out Cain.

Genesis 6
9 These are the generations of Noah: Noah was a just man and perfect in his generations, and Noah walked with God.

10 And Noah begat three sons, Shem, Ham, and Japheth.

Genesis 10
1 Now these are the generations of the sons of Noah, Shem, Ham, and Japheth: and unto them were sons born after the flood.

2 The sons of Japheth; Gomer, and Magog, and Madai, and Javan, and Tubal, and Meshech, and Tiras.

6 And the sons of Ham; Cush, and Mizraim, and Phut, and Canaan.

22 The children of Shem; Elam, and Asshur, and Arphaxad, and Lud, and Aram.

But the purpose of the generations of Adam is to show a direct line between him and Noah - it has no other purpose. The purpose of the generations of Noah is to show the men who peopled the Earth after the flood. You’re attempting to apply the same reasoning to two different things.

A list of Noah’s children and grandchildren doesn’t serve the same purpose as a list of Noah’s male ancestors in direct lineage. 

And if you weren’t so quick to sneer at semantics, you might understand why you’re getting this wrong.

Boru