Hi Ireland,
Gen 6:2 the sons of God saw the daughters of men, that they were good. And they took wives for themselves from all whom they chose.
Among the people of that time there were those that were known to serve God/obey God, such as the family of Seth.
Gen 4:26 And there was also a son born to Seth, and he called his name Enos. Then men began to call upon the name of Jehovah.
Now it is not hard to think that those people that showed special reverence to God were considered/called "sons of God." There are Scripture that indicate that.
Psa 82:6 I have said, You are gods; and all of you sons of the Most High.
v. 7 But you shall die like men, and fall like one of the princes.
Now those others that were referred to as the "daughters of men" may have been the rest that were not so godly/righteous. One family that comes to mind is Cain's. Would the Scripture that says "Cain went away from the presence of the Lord" suggest that he did not serve/obey God after he was cursed (well not before that as well)?
Gen 4:16 Then Cain went away from the presence of the LORD and settled in the land of Nod, east of Eden.
I just think there are plausible explanations for this, rather than the notion that literal ethereal angels were marrying physical women. Even all the different forms of flesh (fish, birds, animals and human), these cannot mix and reproduce, now alone things from different realms of being.
mercy, peace and love
Kat