There is no question in my mind that the ancients didn't simply make up their various mythologies. I began to question that assumption when I began to realized the differences in the descriptions of the world before Christ, and what is seen now.
I had a NT teacher, Dr. Conyers. At the time I was a freshman in college, and was very puerile and superstitious in the faith. I had all kinds of incapatible ideas swimming around in my head. I was a Dispensationalist, a Christian Zionist...but I repeat myself...a fundamentalist, yet still toying with Pentecostalism and Charismania. My view of Inspiration was more in line with Jack Chick than with St. Paul. Bill Gothard was a modern Apostle.
Needless to say, I didn't take Conyers' scholarship seriously. So I offhand rejected many of the things he presented in class. I argued with him a few times. He was a patient man, rest his soul.
A few years later, as I learned, and grew in the faith, and had developed a more systematic approach to theology, something leaped off the page to me.
And the seventy returned again with joy, saying, Lord, even the devils are subject unto us through thy name. And he said unto them, I beheld Satan as lightning fall from heaven. Behold, I give unto you power to tread on serpents and scorpions, and over all the power of the enemy: and nothing shall by any means hurt you. Notwithstanding in this rejoice not, that the spirits are subject unto you; but rather rejoice, because your names are written in heaven. - Luke 10:17-20
The Seventy had gone out into a very different world than the one we live in today. Devils were everywhere.
When the even was come, they brought unto him many that were possessed with devils: and he cast out the spirits with his word, and healed all that were sick: - Matthew 8:16
And at even, when the sun did set, they brought unto him all that were diseased, and them that were possessed with devils. - Mark 1:32
They even knew their names.
But when the Pharisees heard it, they said, This fellow doth not cast out devils, but by Beelzebub the prince of the devils. - Matthew 12:24
Now how many times did anyone from our youth mission trips, or even from international missions, come back rejoicing that even the devils were subject to them in Jesus's name?
Then I began to think of Pharaoh's magicians, how they turned their rods into snakes, and to a point could mimic the plagues God was sending through Moses.
And I recalled something Conyers had said. I believe he was talking about this very phenomenon that I've described, and he mentioned something called The Disenchantment of the world. He was basically describing the result of the spread of the Gospel on the proliferation of magicians. I've searched and searched for something called "The Disenchantment" but to no avail. I don't even know if I'm remembering it correctly.
Anyway, I began to realize that the mythologies were, by and large, true. I don't mean they have the truth. What I mean is the people were worshipping real supernatural entities that were deceiving them. I was reading something from Augustine...I think it was in The City of God...and Augustine said, matter of factly, that we know the demons' names by the names of the idols.
So, yes. I think those fallen angels have much to do with the myths of the 'gods and goddesses', as you say.