Laura asked: Who were the Nephilim?
There are basically three views regarding the identity of these “sons of God” who produced the Nephilim, or giants, in the land.
One view says the “sons of God” were fallen angels who cohabited with women and produced a race of half-angel, half-human beings.
The problem with this view is that angels aren’t created with the ability to procreate. Matthew 22:30 says angels aren’t given in marriage. That doesn’t just mean angels don’t get married; it means they cannot fulfill one of the primary functions of marriage, which is reproduction.
Angels weren’t created with the ability to produce sperm, or seed—DNA that could unite with a woman’s DNA to produce a child. This view belongs in the comic books, as far as I’m concerned.
Another view is that the “sons of God” were godly descendants of Seth’s line in the family tree, but they married ungodly women. It’s hard for me to imagine that godly men suddenly started marrying ungodly women, although that can certainly happen.
The third view, which I believe, is that demons were involved here. The phrase “sons of God” is found in the Old Testament for angelic beings (Job 1:6; 2:1; 38:7), and I believe it’s used here for angelic beings who fell in rebellion against God, along with their leader, Satan.
Ever since then, they’ve attempted to corrupt mankind in any way they can. In 2 Peter 2:4-5 and in verses 6-7 in the book of Jude, demons are related to this incident here in Genesis chapter 6, so something is taking place in which the demons are involved.
I believe fallen angels literally possessed unbelieving mankind to a large extent, intending to corrupt their offspring with a demonic, wicked character.
The offspring of these demon-possessed men included Nephilim, or giants. You can understand the word Nephilim to be a reference to physical giants or a reference to famous men or mighty leaders—frankly, they might have been both.