What Biblical passages lead you to believe that?
Yet the Bible does not say God's purpose for making the flood was to kill Nephilim. It says the primary target was "man on the earth".
5And GOD saw that the wickedness of man
was great in the earth, and
that every imagination of the thoughts of his heart
was only evil continually.
6And it repented the LORD that he had made man on the earth, and it grieved him at his heart.
7And the LORD said, I will destroy man whom I have created from the face of the earth; both man, and beast, and the creeping thing, and the fowls of the air; for it repenteth me that I have made them.
Where do you read that it was to kill the Nephilim?
Well if you had read Genesis chapter 6, it was the sons of God that came down and seduced women. These being the fallen angels of Satan's, unto which produce the Nephilim Giants. Which produce the wickedness of man.
But not the whole earth was destroyed by the flood of Noah's.
Note here in the book of Genesis 10:1-5
1--"Now these are the generations of the sons of Noah, Shem, Ham, and Japheth: and unto them were sons born after the flood.
2 The sons of Japheth; Gomer, and Magog, and Madai, and Javan, and Tubal, and Meshech, and Tiras.
3 And the sons of Gomer; Ashkenaz, and Riphath, and Togarmah.
4 And the sons of Javan; Elishah, and Tarshish, Kittim, and Dodanim.
5 By these were the isles of the Gentiles divided in their lands; every one after his tongue, after their families, in their nations"
So if by your standard the whole earth was destroyed by the flood of Noah's.
If this is to be true then how did the
isles of the Gentiles survive the flood of Noah's.
The isles of the Gentiles are living breathing human beings people.
So if the flood of Noah's covered destroyed all life on Earth, then how did the Gentiles survive. In Verse 5 above?