I searched the verses in genesis where the word angel, malak, occurs and the lion's share of them are in reference to the LORD.
Notice even in Jacob's blessing upon Joseph's two sons
Genesis 48
15Then he blessed Joseph and said:
“May the God before whom my fathers Abraham and Isaac walked,
the God who has been my shepherd all my life to this day,
16the angel
c who has redeemed me from all harm—
may He bless these boys.
16 c Or
Angel
And notice what God said in the Genesis 6 verse implied in the OP that allegedly calls angels 'sons of God' that saw that the daughters of men were beautiful took wives whomever they chose.
3So the LORD said, “My Spirit will not contend with man forever,
a for he is mortal; his days shall be 120 years.”
3 a LXX and Syriac
My Spirit will not remain in man forever
I know that Genesis records the descendants of Adam and how long they lived, but I'm wondering here. IS there any account that anyone died apart from Abel, whose life is cut short by Cain, up to this point? Is this the actual moment God's judgment that "ye shall surely die" is officially rendered?
Going by this chart, it seems that everyone was alive up to Noah's time. Enoch "did not see death" and this chart shows Adam dying after Noah has been born, by 50 or so years? And the chart shows most of those listed before his birth dying before the flood, but how long did it take Noah to actually build the ark from the time of God's pronouncement?