Who are the sons of God found in Genesis 6:1-4?

The sons of God are actually fallen angels who had decided to take women and create abominations.  The term sons of God is used several times within scripture as referring to angels (Job 1:6, 2:1).  The term son of God also shows direct creation as with Adam (Luke 3:38).  There are those who claim that angels cannot do this and use Matthew 22:30 as reference.  But it needs to be remembered that Jesus was referring to Heavenly angels, not fallen ones.  Angels are always men (Genesis 18:2), they can eat (Genesis 18:8), they can touch people (Genesis 19:16), and do many other things.  This is not out of the realm of possibilities for angels to do.  God has chained these angels up and they are waiting for the judgment to come (Jude 1:6, 2 Peter 2:4).