The fallen angels who started the Nephilim are spoken of in Jude 1:6 "And the angels who did not keep their proper domain, but left their own abode, He has reserved in everlasting chains under darkness for the judgment of the great day; 7 as Sodom and Gomorrah, and the cities around them in a similar manner to these, having given themselves over to sexual immorality and gone after strange flesh, are set forth as an example, suffering the vengeance of eternal fire."
Yes, materializing in physical form was apparently a provision given to God’s spirit sons who were also free willed. They could obviously materialize without God’s permission, as God is all knowing and would have forbidden them if it was his will. Do you have thoughts about God’s permission of evil? Why has he allowed the devil and his angels such freedom to wreak havoc on the earth, and also in heaven for a time.
Does the account in Job answer that question?
When satan appeared to Eve as a serpent, perhaps he gave himself that form to converse with her? All we know is that that “original serpent” was identified in Revelation 20:1-3, as ”the devil” and “satan”.
However those angels were not the only angels to fall. Genesis 6 also says "4 There were giants 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." Goliath and his brothers were from a nation of Nephilim. This is why God commanded the Israelites to kill all of them including children.
You are speaking about two totally different times…one pre-flood….the other post-flood.
The Nephilim were the children born to the demon angels whom God wiped out in the flood. All that breathed, perished in the deluge, except Noah and his family and the animals that God brought to Noah…..they were the only survivors.
Those mentioned after the flood who were of extraordinary size we’re not the original Nephilim because no Nephilim survived the flood. Nor does the Bible say that the Nephilim reproduced…..as hybrids, they were probably sterile.
Reviewing the account, we see in Genesis 4:1-3 that tells of “the sons of the true God” taking human women for their own pleasure…..“all whom they chose”, and of Jehovah’s statement that he was going to end his patience with men after 120 years.
Verse 4 then speaks of the Nephilim proving to be in the earth “in those days,” (evidently the days when God made the statement). Then it shows that this situation continued “after that, when the sons of the true God continued to have relations with the daughters of men,” and describes in more detail the results of the union of “the sons of the true God” with women in the 120 years that he had foretold, alowing Noah to have a family and to build the enormous structure that was going to preserve all air breathing life, when a deluge was to sweep away the wicked.
Who then were the giants spoken of in Numbers 13:31-33
“The ten spies” who brought back to the Israelites in the wilderness a false report on the land of Canaan, promised to them by Jehovah, declared:
“All the people whom we saw in the midst of it are men of extraordinary size. And there we saw the Nephilim, the sons of Anak, who are from the Nephilim; so that we became in our own eyes like grasshoppers, and the same way we became in their eyes.”
No doubt there were some large men in Canaan, as other scriptures show, but never except in this “bad report,” which was carefully couched in language designed to strike terror and cause panic among the Israelites, are they called “Nephilim”. They were identified as ”the sons of Anak”. (Deut 9:1-3)
Their great stature caused them to be used as a standard of comparison in describing even the giantlike men of the Emim and the Rephaim. Their strength apparently produced the proverbial saying: “Who can make a firm stand before the sons of Anak?”
Although called “Nephilim” by the cowardly Israelite spies, they were not any relation to the pre-flood offspring of the demon angels.
Whether the Anakim were related to the Philistines in some way is not stated in Scripture, but they too had their “giants”…Goliath and his brother.
Even today, the Maasai in Africa are a very tall race of people.
In Revelation when it says a third of the angels fell with Satan, because of those words "and also afterward," I believe that Satan was the first one to fall, but the rest of the third that would fall was not all at the same time.
I am inclined to believe that too, because Satan works on people over a period of time (and maybe his angelic brothers too) to convince them of the benefits of doing as he says under the guise of freedom….but all they are doing is swapping one master (a benevolent one) for another, deceptive and malevolent in more ways than we can imagine.
Back in the mid 80's God seemed to have put me on assignments. One of those assignments was at a company who had a black witch that managed the accounting department. She hired me because of my birthday. Everyone in her department had to be a Leo. As it turned out she had two familiar spirits, and also two girls in our department also had a familiar spirit each. In the front office I had paperwork to fill out for employment which was handled by the secretary of the president. We became friends as it was obvious to us that each other was a Christian. She had sensed that something was wrong in the company but didn't know what or where. That's were I was needed. She had no idea about the lives of those of us in the back of the office - accounting. She and I would come to work an hour early to pray through the office to cleanse it from evil spirits. One by one all three of those women left the company.
Anyone who has encountered these people, (agents of the devil) will know how evil infiltrates their lives and the lives of those around them, so that it makes it difficult to break free.
Prayer is powerful.