Hi CroRef,
Can we not say for a certainty and that it be held an absolute in our thinking that angels cannot reproduce and go from there with the rest of what we might believe when making our case[s]?
In the similar sense to when Satan took on the form of the Serpent, angels can take on human form. Hebrews 13:2 tells us we have entertained angels unawares. Satan can even transform himself into an angel of light. Angels are greater in power and might than man and God has already said of man, nothing shall be restrained from him that he had imagined to do. (Genesis 11:6)
We have this additional insight that I want to draw from a past conversation on this subject:
And the angels which kept not their first estate, but left their own habitation, he hath reserved in everlasting chains under darkness unto the judgment of the great day. (Jude 6)
For Christ also hath once suffered for sins, the just for the unjust, that he might bring us to God, being put to death in the flesh, but quickened by the Spirit: By which also he went and preached unto the spirits in prison; Which sometime were disobedient, when once the longsuffering of God waited in the days of Noah, while the ark was a preparing, wherein few, that is, eight souls were saved by water. (1 Peter 3:18-20)
The context of 1 Peter 3:19-20 is interesting. Why should Peter identify these spirits in prison; Which sometime were disobedient, when once the longsuffering of God waited in the days of Noah, while the ark was a preparing, wherein few, that is, eight souls were saved by water. (1Pe 3:19-20 KJV)? He is clearly talking about two different beings, "spirits in prison" and "souls saved by water".
This is tall corn as they say, but the story of the flood would seem to begin with the account of 'rebellious spirits'. The sons of God saw the daughters of men that they were fair; and they took them wives of all which they chose. (Genesis 6:2 KJV) This brings us to Jude 6, And the angels which kept not their first estate, but left their own habitation. Our word here for 'habitation' is a word that means 'house' or dwelling place. They had the power to do it, and they apparently did.
"The Old Testament only ever seems to use 'sons of God' to describe angels. It is a very apt description of angels in that they were not 'sons' to anyone else; they were created as an entire species by God Himself. Those who have received their life direct from God, without an intermediary, are justifiably described as 'sons of God'; Which was the son of Enos, which was the son of Seth, which was the son of Adam, which was the son of God.(philologos on Luke 3:38 KJV)
Again, the letter of Jude includes an interesting verse; And the angels which kept not their first estate, but left their own habitation, he hath reserved in everlasting chains under darkness unto the judgment of the great day. (Jude 1:6 KJV) Now who are these? and again why are they singled out from all 'fallen angels'. If it is true that demons are 'fallen angels' we know that a fair number over them are definitely not 'reserved in everlasting chains' but are wreaking destruction worldwide. There seems to be a sub-set of fallen angels here who have received unique punishment; who are they? Could they be the 'rebellious 'sons of God' of Genesis 6 whose offspring are called Nephilim (fallen ones)? and if so what happened to them after the Flood?
Were they 'imprisoned' in 'everlasting chains'? Why was their sins so punished? There is a cryptic comment regarding Noah; These are the generations of Noah: Noah was a just man and perfect in his generations, and Noah walked with God. (Gen 6:9 KJV) whereas God's description of the rest of humanity is; The earth also was corrupt before God, and the earth was filled with violence. And God looked upon the earth, and, behold, it was corrupt; for all flesh had corrupted his way upon the earth. (Gen 6:11-12 KJV).
It seems as though Noah and his family may have been the last pure-bred humans on earth. If Noah and his family had become 'corrupted' in their generations there could have been no incarnation. This rebellion would have blocked the way to Christ being made flesh. Their rebellion was quoshed and the wicked spirits that had instigated it were put 'in prison', 'reserved in everlasting chains'.
I think it is these to whom Christ preached 'in prison'. The word 'preach' here is not 'evangelise' but 'proclaim'. The NASB has captured the sense well; in which also He went and made proclamation to the spirits now in prison, (1Pe 3:19 NASB) The purpose of the 'preaching' was not to deliver these 'spirits in prison' but to proclaim the finality of God's plan in Christ. Their wicked plan had been frustrated and Christ declared his triumph to these spirits in prison.
This can only ever be a hypothesis. We don't have enough information to settle it as a biblical doctrine but, to me, it is the best hypothesis I have been able to shape." (Excerpt taken from https://www.sermonindex.net/modules/newbb/viewtopic.php?topic_id=2942&forum=36&start=40&viewmode=flat&order=0)
As an additional thought I want to suggest that God would have never destroyed the world over unequally yoked marriages. The sin nature is transmitted to all people so it is nonsense to think a pure blood line could have been maintained by marrying up the sons of Seth with the sons of Seth. Noah and his kids were of the sons of Seth and their descendents plunged the world into ruin. One of the greatest truths in the bible is that Godliness and election are not naturally heriditary but spiritually (In Christ). Blessings.