Study of Dead Sea Scrolls, will clear of this teaching about sons of God being Adams descendants. They were 200 watchers angels sent to earth to observe mankind. In the dead sea scrolls they found 2 more old testament historical books we don'y have in our English bibles. Of the top 16 O.T. books 39 copies of Psalms were found making it number one. The second book was Deuteronomy @ 33 copies or piece of copies, Ranked third was the book of Enoch with 25 copies, Genesis @ 24 copies, Isaiah @ 22 copies, Seventh was Jubilees with 21 Copies, and the list gets smaller. The book of Esther was the only O.T. book not found. These two new historical book were canon during Jesus time so why are they not now. They clearly explain the sons of God in Genesis 6.
I have always had a problem with the NUMBER of books in our bible. 66 books, come on Christrians, the number 6 says not complete and it is the number of man and 66 doubles the meaning of six. Then there is the number 666 we all know. THERE IS AT LEAST 70 BOOKS and here is two of them. These books will totally answer this discussion once and for all. The books can be ordered from Amazon. The dead sea scrolls is the greatest discovery of our time.