Thanks for a civil discussion . Okay ,let's continue ,it started with Eve , actually no , it actually started at the rebellion ,however that's a different subject even though they're tied together. With Eve Cain and Abel were twins by different fathers ,that's why Cain has his own genealogy . Gonna zoom to Noah (Gen 6)
To start , yes it was millions of people on earth at this time ,considering as you said how long they lived .
Genesis 6:8 "But Noah found grace in the eyes of the Lord."
At this point in the chapter wickedness was great in the world , however the angels were only concerned with the seedline of the woman, Eve
Genesis 6:9 "These are THE GENERATIONS OF NOAH; Noah was a just man and perfect in his generations, and Hoah walked with God."
The term, "and perfect in his generations," is referring only to his ancestry. Does it mean there was no sin in them? No; for we know sin came into this world through his ancestors, because the Bible clearly tells us of the sins of Adam and eve in Genesis 3, and Enos in Generation 4:26. Both Noah, and his wife came from families which are recorded in the scriptures, as not mixing with the fallen angels. Neither of them had a drop of angels blood in their veins.
The word "generations" in the Hebrew text is # 8735 in Strong's Hebrew Dictionary, and comes from the Hebrew prime; "Toledoth", and means family tree, or history. When we take "family history called "perfect", in the Hebrew text it is called "tamin", that family is "without blemish as to breed, or pedigree".
This verse does not speak of Noah's moral perfection, but tells us that he and his family had preserved their pedigree, and kept it pure, inspire of the prevailing corruption brought about by the fallen angels, [their children were called "Nephilim"].
Lets look at Gen 6 from the companion Bible
This irruption of fallen angels was Satan's first attempt to prevent the coming of
the Seed of the woman foretold in gen. 3:15. If this could be accomplished,
God's Word would have failed, and his own doom would be averted.
As soon as it was made known that the Seed of the woman was to come through
ABRAHAM, there must have been another irruption, as recorded in Gen. 6:4,
"and also after that" (i.e. after the days of Noah, more than 500 years after the
first irruption). The aim of the enemy was to occupy Canaan in advance of
Abraham, and so to contest its occupation by his seed. For, when Abraham
entered Canaan, we read (Gen. 12:6) "the Canaanite was then (i.e. already) in
the land."
In the same chapter (Gen. 12:10-20) we see Satan's next attempt to interfere
with Abraham's seed, and frustrate the purpose of God that it should be in
"Isaac". This attempt was repeated in 20:1-18.
This great conflict may be seen throughout the Bible, and it forms a great and
important subject of Biblical study. In each case the human instrument had his
own personal interest to serve, while Satan had his own great object in view.
Hence God had, in each case, to interfere and avert the evil and the danger, of
which his servants and people were wholly ignorant. The following assaults of
the great Enemy stand out prominently :--
l The destruction of the chosen family by famine, Gen. 50:20.
l The destruction of the male line in Israel, Ex. 1:10, 15, &c. Cp. Ex. 2:5.
Heb. 11:23.
l The destruction of the whole nation in Pharaoh's pursuit, Ex. 14.
l After David's line was singled out (2Sam. 7), that was the next selected for
assault. Satan's first assault was in the union of Jehoram and Athaliah by
Jehoshaphat, notwithstanding 2Chron. 17:1. Jehoram killed off all his
brothers (2Chron. 21:4).
l The Arabians slew all his children, except Ahaziah (2Chron. 21:17; 22:1).
l When Ahaziah died, Athaliah killed "all the seed royal" (2Chron. 22:10).
the babe Joash alone was rescued; and, for six years, the faithfulness of
Jehovah's word was at stake (2Chron. 23:3).
l Hezekiah was childless, when a double assault was made by the King of
Assyria and the King of Terrors (Isa. 36:1; 38:1). God's faithfulness was
appealed to and relied on (Ps. 136).
l In Captivity, Haman was used to attempt the destruction of the whole
nation (Est. 3:6, 12, 13. Cp. 6:1).
l Joseph's fear was worked on (Matt. 1:18-20). Notwithstanding the fact
that he was "a just man", and kept the Law, he did not wish to have Mary
stoned to death (Deut. 24:1); hence Joseph determined to divorce her.
But God intervened : "Fear not".
l Herod sought the young Child's life (Matt. 2).
l At the Temptation, "Cast Thyself down" was Satan's temptation.
l At Nazareth, again (Luke 4), there was another attempt to cast Him down
and destroy Him.
l The two storms on the Lake were other attempts.
l At length the cross was reached, and the sepulcher closed; the watch set;
and the stone sealed. But "God raised Him from the dead." And now, like
another Joash, He is seated and expecting (Heb. 10:12, 13), hidden in the
house of God on high; and the members of "the one body" are hidden
there "in Him" (Col. 3:1-3), like another Jehoshaba; and going forth to
witness of His coming, like another Jehoiada (2Chron. 23:3).
The irruption of "the fallen angels" ("sons of God") was the first attempt; and
was directed against the whole human race.
l When Abraham was called, then he and his seed were attacked.
l When David was enthroned, then the royal line were attacked.
l And when "the Seed of the woman" Himself came, then the storm burst
upon Him.