When God says My son, there's only one answer a son of God.
One thing I was taught by my pastor was already mentioned. I have heard other preachers confirm this and eventually taught it myself. It's hard to disprove that negative if that's all you know. It wasn't the traditional plain view of those who take it literally to prove the cross kinds offspring theory wrong. It was the cross kind mating theorists to prove their case.
I was one to believe what I was first taught by those I highly respected because they had spent so much time in the word than this kid. I simply repeated what I was told with the "sons of God" the only use being angels and Adam. However, there were no other children of God in the OT because I was also taught dispensationalism which had a whole new set of variables that depended upon a certain set of teachings that a saved person would not come to on their own just reading the Bible for themselves. All that to say that I was wrong all those years about that topic. I even went to Colonial R.B. Theimes conferences where I took careful notes while he taught.
You already pointed to one verse that disproves my old theory. Here's one I found in the OLD testament. I didn't have to read far either. It's in Deuteronomy chapter 32.
18Of the Rock that begat thee thou art unmindful, and hast forgotten God that formed thee.
19And when the LORD saw it, he abhorred them, because of the provoking of his sons, and of his daughters.
Am I mistaken here? The Lord, the Rock begat thee reminds me of Jesus ' rebuke of the pharisee teacher of the law in John 3.
"Know ye not that ye must be born again. Apparently there was a Father and son relationship with those in the Old testament. I was taught that new birth did not occur until the NT, but my pastor was wrong, so I was too.
Here we get further clarity of the fact that unregenerate sons and daughters of men can become sons and daughters of the LORD.
That leads me to think that the fair daughters of men in Genesis 6:2 were humans as were the sons of God. I've heard all kinds of theories about crossing kinds and that they did Not reproduce after their own kind as God Himself stated over and over again.
Ellen G. White, an 7th Day Adventist whos writings carry the same authority of scripture as the Bible according to that false religion. She taught this.
Considering, her trances and unbiblical writings, that really isn't convincing that certain kinds of animals inter bred. Likewise, the angels are not humans and we have no indication of them reproducing other than occult sources and scary movies like Rosemary's baby. Angel kind and man kind do not mix.
Plus the sons of God theory is disproven by Old Testament scriptures.