Googled and chosen at random, but readily available elsewhere:
The phrase "sons of God" is used many times in the Bible to refer to men, but more specifically, God's followers here on earth (see Hosea 1:10). In Luke 3:38, Adam is called "the son of God" and throughout the new Testament, Christians are referred to as "the sons of God". Take for instance these familiar verses: "Behold, what manner of love the Father hath bestowed upon us, that we should be called the sons of God: therefore the world knoweth us not, because it knew him not. Beloved, now are we the sons of God, and it doth not yet appear what we shall be: but we know that, when he shall appear, we shall be like him; for we shall see him as he is." (1 John 3:1-2) Notice that John uses this title twice in reference to believers in Jesus Christ. Again in John 1:12, we find him using it again in the same manner, "But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name". Paul also used this phrase the same way in Romans 8:15 and Philippians 2:5.
So since the "sons of God" are the people on earth that serve and follow the Lord, it would make sense that "the sons of men" or "the daughters of men" could be a title for the wicked people that don't serve God. Does the Bible support this idea? Yes it does; In Genesis 11:5, those who had rebelled against God to build the tower of Babel were called "the sons of men" (NASB & RSV) or "the children of men" (KJV). In the Psalms, the wicked enemies of David were sometimes called "the sons of men"(Psalm 4:2 & Psalm 57:4). Other times, this phrase was used for the human race in a general sense, but it was a title for the wicked in certain cases.
Now here in Genesis 6, we find these two opposing groups: the "sons of God" and "the daughters of men". It's important to note that the book of Genesis is a narrative that flows from chapter to chapter. In Chapters 4 and 5 we have two groups as well: the descendents of Cain and Seth. If we read Genesis and the story of how sin entered this world, we find that the sons of God are those who are faithful to God and His plan for salvation, from Adam to Abel and down to Seth. On the other hand, the sons and daughters of men are those who are the children of Cain. Genesis 4:15-16 states that the Lord put a mark on Cain and he went out from the presence of the Lord and was driven to the land of Nod on the East side of Eden. From here, there was a separation between Cain's descendants and those of Seth.
Throughout the history of this world, we find God's people mixing with the "daughters of men" and we observe the outcome throughout the Bible - apostasy! The result is a leaving of God's plan for their lives and a yielding to sin. And unfortunately, that's happened here in Genesis chapter 6 and this is what led up to the flood (verses 5-7), which is one of the other reasons why we know that these "sons of God" were not angels. The judgment pronounced upon the earth was against "man" (verses 3 and 5). God would not punish man because of something the angels had done.
It's always been God's plan that believers should not be
"unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness?" (2 Corinthians 6:14) The sons of Seth made the grave mistake of intermingling with the "heathen" women, and with these relationships came the influence for evil and compromise. Apparently, they chose worldly pleasure over the Lord and this resulted in Noah being the only righteous person left on the face of the entire earth! (Genesis 6:8-9, and 7:1)
Who Were the Giants or Nephilim?
What about these mighty men or giants found in Genesis 6:4? (The Hebrew word used in this verse is "Nephilim") Remember that just shortly before the flood, Adam lived, as well as Enoch (who was translated to heaven because he walked continually with God) and Methuselah. (Genesis 5). They lived over 900 years and some believe that these people were over 9 feet tall. So maybe giants weren't that uncommon in those days. Perhaps these growth spurts occurred because of the breeding that took place between these two formally isolated tribes. It's also interesting to note that the original Hebrew word "Nephilim" which is translated "giants" in this verse can simply mean "a bully or tyrant" (Strong's Concordance).
Source:
(your word picture made me laugh, good job).
