I've been curious about this.
Genesis 6:2-4
That the sons of God saw the daughters of men that they were fair; and they took them wives of all which they chose. ............ when the sons of God came in unto the daughters of men, and they bare children to them.
What does all mean?
What's the "Christian" take on this?
P.S. I really am curious loco. But based on anyone's answer ti may lead into a debate 
Hey, OzmO!
This is my take on it:
Genesis 6:2-4 (New International Version)2 the sons of God saw that the daughters of men were beautiful, and they married any of them they chose. 3 Then the LORD said, "My Spirit will not contend with man forever, for he is mortal; his days will be a hundred and twenty years."
4 The
Nephilim were on the earth in those days—and also afterward—when the sons of God went to the daughters of men
and had children by them. They were the
heroes of old, men of renown.
"sons of God" means angels as STella has shown above. Nephilim is an ancient Aramaic word which nobody knows today exactly what it means. It could mean "giant" or "fallen one". Satan and his angels(demons) are fallen angels. If you read in verse 4, it looks like the fallen angels(Nephilim) were already on the earth when the "sons of God"(other angels, not Nephilin) "went to the daughters of men and had children by them." Then it says "They were the heroes of old, men of renown."
The next verses may be talking about these angels who had sex with women.
2 Peter 2:4 4For if God did not spare angels when they sinned, but sent them to hell, putting them into gloomy dungeons to be held for judgment;
Jude 1:66And the angels who did not keep their positions of authority but abandoned their own home—these he has kept in darkness, bound with everlasting chains for judgment on the great Day.
1 Peter 3:18-20For Christ died for sins once for all, the righteous for the unrighteous, to bring you to God. He was put to death in the body but made alive by the Spirit, 19through whom also he went and
preached to the spirits in prison 20who disobeyed long ago when God waited patiently in the days of Noah while the ark was being built. In it only a few people, eight in all, were saved through water,
Looks like their punishment was to be put into spiritual prisons where they are disconnected from reality, both spiritual and physical. It looks like between Jesus' crucifixion and resurrection, Jesus' spirit went to this spiritual prison to preach to these demons, probably to show them and tell them that He, Jesus, had just been victorious in offering Himself for the sins of all humans. Unlike Satan and his demons, these imprisoned angels would not have known what was going on here on earth and would not have known that God had sent His Son to die for the sins of humans.
Does the following look like Greek mythology?
Genesis 6:4"The Nephilim were on the earth in those days—and also afterward—when the sons
(Zeus?) of God went to the daughters
(Alcmene?) of men and had children by them. They were the heroes of old, men of renown
(Hercules?)."
Yes, it does look like Greek mythology. But thanks to history and archeology we know that Genesis 6:4 is much more ancient than Greek mythology. So Genesis 6:4 could not possibly have come from Greek mythology, but it would be the other way around, that some of Greek mythology is based on Genesis 6:4. People who witnessed these "heroes of old, men of renown" would have passed this information from generation to generation, to Noah's children, from Noah's children to those who would later become the Babylonians, then to the Persians, then to the Greeks and eventually to the Romans. Many have theorized that mythology can contain grains of truth in the form of a highly distorted "folk memory". But what was recorded in Genesis 6 is what truly happened and not mythology.
