WHO WERE THE SONS OF GOD IN GENESIS CHAPTER 6:2 I believe that the sons of GOD WERE THE ANGELS because of the giants in those days.
These verses speak of us as the sons of God.
Romans 8:14,Matthew 5:9,John 1:12
In that case, there was a sort of "knowing" between the Spirit of God and the dead spirit of man to caused a "birth" of a "new creature".
The recipe for that sort of reproduction isn't clearly delineated in scripture either.
Admittedly, our sonship is a foundational truth whereas the angelic is only speculative.
"Divine Grace is not opposed to effort ...
it is opposed to earning "
— Dallas Willard