It's the way God produced the seven Billion Humans (descendants of Adam) alive on planet Earth today, in just 10-11k years. One Million sons of God (prehistoric people) were on our Earth when Noah first arrived here, from Adam's world, which was totally destroyed in the flood. ll Peter 3:6
Noah's grandsons, like Cain on the first Earth, had NO other Humans to marry, so they married and produced children with the prehistoric people who had been on Earth for millions of years before the Ark arrived here. Science has confused the sons of God with Humans.
The sons of God had their origin in WATER on the
5th Day Gen 1:21. They are
THEIR (Trinity kinds) while Humans are
HIS (YHWH/Jesus) kinds, or the kinds made by the Hands of Jesus, temporarily, since Humans are subject to death, unless they are born again by the Trinity. The ability to interbreed is shown here, with my views in brackets:
Gen 6:4 There were {intellectual} giants in the earth in those days; and also after that, {on planet Earth} when the sons of God {prehistoric man} came in unto the daughters of men, {Adam's descendants} and they bare children to them, the same became mighty men which were of old, men of renown.
Today's Humans have the DNA of prehistoric people AND the superior intelligence of Adam, which is like God's Gen 3:22. Thus, we are a combination of His and Their kinds. Amen?