1 And it came to pass, when men began to multiply on the face of the earth, and daughters were born unto them, 2 That the sons of God saw the daughters of men that they were fair; and they took them wives of all which they chose.
There has been some debate as to what is meant by “sons of God” and “daughters of men.” Proposed theories are as extreme as “sons of God” meaning fallen angels, that coupled with human women (daughters of men) to produce a race of demigod giants. Which, if true, holds many unsettling implications.
I personally find far more believable, and far more fitting in the context of the previous two chapters, the theory that the “sons of God” refers to the male Sethites, or those who believe in God and followed His precepts. Meanwhile the “daughters of men” would refer to the female Cainites, or those who had rejected God.
And this interpretation would also align today’s verses with a common theme in the bible: how intimacy with the things of the world turns mankind from God. It is seen in Adam receiving the fruit from Eve, in the Israelites chasing after false gods of the heathen, and in the Jews being so caught up with their embellished law that they could not recognize the Savior when he stood before them.