Who exactly are these 'Sons of God' in Genesis 6? Also isn’t the 'Seth view' of this passage wrong in many ways since Seth was not God and Cain was not Adam. Plus there was obviously a genetic defect after these sons of God took wives of whom they chose. Lastly I would like to mention 'Sons of God' is NEVER used as believers in the Old Testament. What is your view on Gen 6?
And it came to pass, when men began to multiply on the face of the earth, and daughters were born unto them, That the sons of God saw the daughters of men that they were fair; and they took them wives of all which they chose. And the LORD said, My spirit shall not always strive with man, for that he also is flesh: yet his days shall be an hundred and twenty years. There were giants in the earth in those days; and also after that, when the sons of God came in unto the daughters of men, and they bare children to them, the same became mighty men which were of old, men of renown. (Genesis 6:1-4)
The scriptures don’t give any more information about who the “sons of God” are in Genesis 6. Anything anybody might say is mere speculation. Since you ask my view I will speculate, even though it means absolutely nothing.
If by the “Seth view” you mean that some people say the “sons of God” were Seth’s offspring and the “daughters of men” were Cain’s offspring, I agree that this seems to be a stretch. Why would such a distinction be made?
My own view is that the King James Version, and subsequent English translations, mistranslate the phrase “ben Elohim.” While the word Elohim may properly be translated “God,” it may also be translated “gods” (plural), “rulers,” or “judges.” I think a more proper translation would be that the sons of the rulers took wives of the common men. This would resolve the question of where the “sons of God” came from, since it would take out the idea that God created other people or that these were other created beings (extraterrestrials?).
This view would actually result in more genetic diversity and not genetic defects. I don’t see anything in the passage that states that “there was obviously a genetic defect” as a result of these marriages. In fact, I see the opposite. The children of these unions (by one interpretation of the passage) became mighty men. (Another reading would say that the giants that were in the land became mighty men. This would not necessarily imply a genetic defect in the children that are no longer mentioned.)
That is my view, although a literal reading of verse 4 can be very interesting. “There were giants in the earth in those days. After that, when the sons of Elohim [God?] came in unto the daughters of Adam [man] and they bare, the same became mighty men, and old, men of Shem.” Because of this last word, I can almost see somebody claiming that Noah was created specially “of God” and his wife was a direct daughter of Adam and they bore the lineage of the Semites. While it could be made to fit, I think this would also be a stretching of the verse.
In the end, we don’t know who these people were. Nor does it really matter. If it made any difference in our salvation or our belief in God or the Bible, then God would have given us more information about just who they were.