I think the "sons of God" in Genesis 6:4 were believers in the godly spiritual line of Seth and Enosh (cf. Genesis 4:26).
These believers eventually intermarried with those who were not, and the earth became more corrupt.
Sons Of God
All who will inherit life immortal will be gods.
Psalm 82:6
“I said, ‘
You are “gods”; you are all sons of the Most High.’ 7 But you will die like mere mortals; you will fall like every other ruler.”
Genesis 6:2
the
sons of God saw that the daughters of men were beautiful, and they took any they chose as wives for themselves.
Genesis 6:4
The Nephilim were on the earth both in those days and afterwards, when the
sons of God came to the daughters of men, and who bore children to them. They were powerful men of old, men of renown.
[Nephilim translated means "Fallen ones." They were [men] who were of a very low moral grade.]
Job 1:6
One day the
sons of God [men] came to present themselves before the LORD, and Satan also came with them.
Job 2:1
One day the
sons of God came again to present themselves before the LORD, and Satan also came with them to present himself before the LORD.
Job 38:7
while the
morning stars sang together and all
the sons of God shouted for joy?
Hosea 1:10
“Yet the Israelites will be like the sand on the seashore, which cannot be measured or counted. In the place where it was said to them, ‘You are not my people,’
they will be called ‘sons of the living God.’
Matthew 5:9
Blessed are the peacemakers, because
they will be called sons of God.
Luke 20:36
For they cannot die anymore, because they are like [angels / messengers] and are
sons of God, since they are sons of the resurrection.
Galatians 3:26
for you are all
sons of God through faith in Messiah Yahshua.
John 10:33-34
33"We are not stoning you for any of these," replied the Jews, "but for blasphemy, because you, a mere man, claim to be (a God)."
34 Yahshua answered them, "Is it not written in your Law, 'I have said
you are gods'? 35If
he called them 'gods,' to whom the word of God came—and the Scripture cannot be broken—
36what about the one whom the Father set apart as his very own and sent into the world? Why then do you accuse me of blasphemy because I said,
'I am God's Son'?
Yahshua was asked if he was the Messiah, he was not asked if he was God. It has always been understood that the Messiah would be a god from Heaven.
John 10:24
The Jews who were there gathered around him, asking, “How long will you keep us in suspense,
if you’re the Messiah, tell us plainly?”
John 1:12
But as many as received him, to them gave he power to
become the sons of God, even to them that believe on his name:
Romans 8:14
For as many as are led by the Spirit of God,
they are the sons of God.
Romans 8:19
For the earnest expectation of the creature waiteth for the manifestation of the
sons of God.
Galatians 4:6
And because
ye are sons, God hath sent forth the Spirit of his Son into your hearts, crying, Abba, Father.
Philippians 2:15
That ye may be blameless and harmless, the
sons of God, without rebuke, in the midst of a crooked and perverse nation, among whom ye shine as lights in the world;
1 John 3:1
Behold, what manner of love the Father hath bestowed upon us, that we should be called the
sons of God: therefore the world knoweth us not, because it knew him not.
1 John 3:2
Beloved, now are
we the sons of God, and it doth not yet appear what we shall be: but we know that, when he shall appear, we shall be like him; for we shall see him as he is.
