"Sons Of God"

Genesis 6:1-4

1: When men began to multiply on the face of the ground, and daughters were born to them, 2: the sons of God saw that the daughters of men were fair; and they took to wife such of them as they chose. 3: Then the LORD said, "My spirit shall not abide in man for ever, for he is flesh, but his days shall be a hundred and twenty years." 4: The Nephilim were on the earth in those days, and also afterward, when the sons of God came in to the daughters of men, and they bore children to them. These were the mighty men that were of old, the men of renown.

A friend of mine from school and I are in the middle of a discussion about who the "sons of God" are in this passage. Some say it refers to fallen angels and others say that it refers to descendants of Seth. The tricky thing is that there are noted Church Fathers on both sides of the debate, with Fathers such as Ambrose, Justin Martyr, and Clement of Alexandria arguing for the fallen angels theory and Fathers such as Augustine, John Chrysostom, and Cyril of Alexandria for the descendants of Seth theory.

Not to mention that the debate has been going on for centuries between rabbis.

At Franciscan University, there is also professors on both sides of the fence with convincing arguments.

So what does everyone out there think, and why?