The Nephilim of Genesis 6 Were Not the Reason for the Flood
There are two opposing misconceptions about Genesis 6 in the Bible. The first is that the “sons of God” were actually the sons of Seth and that they were the ones who married the “daughters of men” who were allegedly the daughters of Cain. This is simply not true. The Bible makes it clear that some of the angels came down, “married” human women, and bore offspring who were the Nephilim.
The second misconception is that the bloodline that was established as a result of these happenings was the reason that God had to bring the flood. This is also incorrect. The giants continued beyond the flood. They may continue into today. If the purpose of the flood was to wipe them out, then a lot of people and animals died for no reason because it didn’t work. No, the giants were there and they continued after the flood, but the flood itself was brought about because of the wickedness of men.
One might say that the wickedness continued after the flood, so in that way it failed as well. I would contend that the wickedness was so great and the path of men was so perverse that God hit the “reset button” in order to right the way and dramatically reduce the wickedness. Man is wicked because of the fall that happened in the Garden of Eden, which means that we will always be wicked in this flesh. However, the flood was likely a way to derail the wickedness temporarily and, when combined with the shortening of human lives to 120 years, allowed for men to have a chance of following God’s way.
Here’s a video that goes into more details on both topics: