The "fallen ones" of Genesis 6:4, the nephilim, were not the offspring of fallen angels and women. They were human beings. The Hebrew word probably comes from naphal, "to fall," so the sense may be that these men fell in battle or fell upon their enemies, or that they were a fallen form of humanity, far removed from what God wanted men to be. The Greek translation, gigantes, gives the English "giants." The sons of God were the godly line of Seth, who began calling on the LORD's name in the days of Enosh. They married the daughters of men, the women of Cain's ungodly line, and their children became mighty men of renown in an evil world. Angels cannot be the fathers, because they are spirit beings who neither marry nor reproduce, and each kind reproduces only after its own kind. The text itself calls the offspring "men," and "came in to" is the ordinary Hebrew idiom for normal human intercourse. The nephilim of Numbers 13:33 were the sons of Anak, probably a Cushite people descended from Babel, so they too were human. The angelic reading also corrupts the gospel, since God is reproducing Himself in humanity, not in angels, who were made as servants. The passage warns God's people not to be unequally yoked with the world.