Defining the Nephilim and the Days of Noah

Defining the Nephilim and the Days of Noah a key to understanding prophecy. There is a pattern established at the beginning of the bible that continues to repeat all the way to Revelation and the end of days. This format is not generally recognized in mainstream Christianity. Since about the third century AD, Christian doctrine has moved to break from the Old Testament and try to become a new religion. This is a big error because Christianity is really the continuation of the faith of Abraham, Isaac, and Jacob.
For those of us who came up in mainstream Christian circles, there was seldom any doubt about the Nephilim. Genesis 6 had something to do with fallen angels mating with women and creating demi-gods and that was that. The doctrine goes further to teach that mankind was destroyed because of these illicit matings. There are a number of problems with this concept right from the get-go.
The Nephilim were on the earth in those days, and also afterward, when the sons of God came in to the daughters of men, and they bore children to them. Those were the mighty men who were of old, men of renown. Then the LORD saw that the wickedness of man was great on the earth, and that every intent of the thoughts of his heart was only evil continually. The LORD was sorry that He had made man on the earth, and He was grieved in His heart. The LORD said, "I will blot out man whom I have created from the face of the land, from man to animals to creeping things and to birds of the sky; for I am sorry that I have made them." (Gen 6:4-7)
The Nephilim are already on the earth before the supposed illicit mating. That's a pretty big problem if we're we are defining the Nephilim as demi-god spawn. Another big problem is why YHVH (the LORD) destroyed mankind. This says He did that because all of men's thoughts were continually evil. He destroyed mankind because of mankind's behavior, not because of a corrupted bloodline.
The Torah was not written with chapters and verses. They were added over 1000 years after the New Testament was completed. If we read the Torah without chapters and verses, we realize that the Sons of God are defined just before the flood. Genesis 5 tells of the holy lineage, which are the Sons of God through Seth. This is confirmed by the beginning of the Messiah's lineage in Luke:
the son of Enosh, the son of Seth, the son of Adam, the son of God.(Luk 3:38)
The video above and the pdf at this link https://firstcenturychristianity.net/defining-the-nephilim-and-the-days-of-noah/ are a teaching to correctly identify what happened in Genesis 6. This is so we can be on the alert for the behavior that will occur at the end of days. When Yeshua (Jesus) spoke of the Days of Noah in Matthew 24, He was not warning us to be on the alert for angels to mate with our women. He was warning us that when the children of God give themselves over to lust, by rejecting their calling, then the end will come. This pattern is established in Genesis 6 and repeated in other places of the Old Testament. We look for an enormous repeat of it at the end of days.