The Sons of God

In Genesis chapter 6, it talks briefly about the sons of God, and the daughters of men. It goes on to say that there were giants in the land, and that the sons of God and the daughters of men had children together. Those children became mighty men, men of renown. Some translations use the term Nephilim instead of giants. Some people teach that this is talking about angels coming to earth, sneaking around behind God's back, and fathering children. These children, the Nephilim, were giants--the progenitors of Goliath. Some even say that the Nephilim could be identified, because they had six fingers on each hand. The six fingers stems from a son of Goliath referenced in 2 Samuel 21:20 and 1 Chronicles 20:6, even though there is no reference to anyone else in the Bible having that particular distinguishing feature. I would also like to point out that it doesn't say that the giants were the children of the sons of God, in fact, it mentions the giants first, and then the sons of God having children by the daughters of men.
Now, Romans 8:14 says that anyone who is led by the Spirit of God is a son of God (unless, of course, one is a daughter of God). I think I should point out that the English language has some interesting gender protocols, as opposed to, say Spanish: In Spanish, the word for son is ‘hijo,’ but the plural of hijo (hijos) isn’t necessarily masculine, it could mean sons, or it could mean sons and daughters. I suspect that Greek is very much the same, so what was translated as ‘sons’ was probably not intended to be gender-specific. 1 John 3:1 says, "Behold what manner of love the Father hath given unto us, that we should be called the sons of God..." I have a hard time with the idea that in Genesis chapter 6, the phrase "sons of God" means angels, but every where else it is used, it means the faithful (and there are other places where the phrase is used [Hosea 1:10, Galatians 4:6, and Philippians 2:15], but only in Genesis 6 could it even be interpreted to mean angels). On the other hand, if what it is talking about in Genesis is faithful followers also, but that were then led away by women that were not faithful (that would never happen, would it? To be honest, I hate to even bring that up, having recently posted that the faithful women in Scripture far outnumber the ‘wicked’ women, but, at the same time, it does tend to be a recurring theme, faithful men getting themselves into trouble by being drawn away from God by things—or people—that look good. We have been told to walk by faith, and not by sight), then it would make sense that God's response to this was to flood the earth, wouldn't it? If it were talking about angels, then wouldn't God's response have been to do something about the angels, rather than about humans?
Further, if the Nephilim were the ancestors of Goliath, why did they not die in the flood? Did one of Noah's sons marry a woman of the Nephilim? Would she have fit in the ark? Maybe, because of their stature and greater physical prowess, they were able to tread water for forty days and nights. Oh, but it only rained for forty days and nights, it still took a considerable amount of time for the floodwaters to recede. I think that we can safely assume that the Nephilim, whatever they were, drowned along with every other living thing that didn’t make it into the ark.
I think that at best, it is considerably unlikely that angels ever had the ability to procreate. I tend to go with Kevin Smith's theory that, from a human perspective, they are as anatomically impaired as a Ken doll (granted, Mr. Smith’s theory suggests that was a change that God implemented after the Nephilim, but a God that knows the end from the beginning would seen the need to keep angel anatomy separate from human anatomy before it ever became a problem). Even if they could, I don't see how their descendents could have survived the flood. I do think that it's an interesting coincidence that, the same verse that talks about the children of God having children that were great warriors also talks about giants, and that Goliath was a giant who was a great warrior, but sometimes things just happen. There’s no real reason to believe that one has anything to do with the other.