Ufology thinking, of course, changes constantly,but I am reading a current book that is creating something of a stir among the UFO believers.
It is called "The Facade' by Michael Heiser.
The book propounds that There is a Supreme creator, Yahweh.
Yahweh is director of a heavenly "council' comprised of created beings
Spirit creatures,who also have great power,including the power of creation,just not as powerful an ability of creation as Yahwehs.
These sprits are (or were) Yahwehs department heads and branch managers.
(psalms 89 v 5,Psalms 82 v 1,1 Kings 22 v19-23,Ephesians 6 v 12)
About 6000 years ago there was a great disagreement in the boardroom.
Yahweh created PHYSICAL beings in his own "image". Mankind.
Mankind were put in dominion over the PHYSICAL creation.
This apparently includes not only the Earth, but also the physical heavens.
Yahwehs department heads and branch managers didnt like this idea one bit.
As they were smarter, more powerful, and had been with the company longer, they felt that Mankind should have been subject to THEM, and they report to Yahweh, and convey all instructions to mankind.
This was in fact the cause of the great "War in Heaven", and the Satanic rebellion.
(Genesis 1 v 26,27, Psalms 8 v 5,6. Isaiah 14 v 12.)
In the course of the ensuing dispute, The Rebel forces have employed their own creative powers, creating other spirit entities and other physical created beings, All of these are INFERIOR to anything the Creator ,Yahweh , can produce, but never the less they are created.
Aliens such as "greys", which are incapable of emotion, are included among these.
This is apparently what Genesis 6, and the world immediately before the flood, is all about. The forces of "Helel" (Satan) creating their own hybrid creation.
The theory caps off with Matthew 24 v 37.
"As it was in the days of Noah"...
The theory is driving at unifying the Bible, God and Ufology.
I found the notion of the Satanic Rebellion being a dispute over authority of the physical creation a new and interesting notion....