[Winman]

I do not believe in the Gap Theory, but I did think the Son of Gods taking the daughters of men as wives could mean angels, because the verses make a distinction between men and the Sons of God.

Gen 6:1 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.

I mean, it's obvious men were marrying women, how else would daughters be born unto them?? If the Sons of God merely meant men, vs. 2 would not be needed, it is obvious from vs. 1. So I see a distinction between "men" and the "Sons of God" in these verses.