?? Why wouldn't Egyptian and Sumerian mythology take after it's originator? The Bible states that satan and a third of the angels were cast down to earth from the eternal dimension God inhabits. Satan is known as the father of lies and is knowledgeable of God and even quotes scripture, so mixing his knowledge with lies would be his forte. Why would it be unimaginable that God's enemies would plant lies anywhere in time that they could? It isn't.
There is much to consider when searching for truth, including our linear confined thinking being trapped in a dimension of time and death.
The Bible tells us of principalities and powers in high places that have power over the air and particular districts and areas of earth. In Genesis, God spoke to Cain and said that sin was at his doorway and sought to enter through him and have power. This dimension is more desireable than the one they are banished to, and we are the only doorways into this one, if we allow them in. Well they have had their time and used men to fulfill their hatred of God throughout time.
Ge 4:7 If thou doest well, shalt thou not be accepted? and if thou doest not well, sin lieth at the door. And unto thee shall be his desire, and thou shalt rule over him.
Eph 6:12 For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places.
I have taken a look at nearly all the literature that seeks to tear down the anchor of hope and truth we have in God's preserved Word, and they manage to attack all possible sides of God's truth, just as any enemy would be expected to do. We are told that we are participants in a war of good and evil that had to be risked and fought in order for choice to be given, and we are also given the complete story from beginning to end in the Bible, as God is not bound to this dimension but sees the beginning and end at the same moment, living outside of time in eternity. We are just now starting to discover the multiple universes, dimensions, and physical properties of time and eternity, and some of this latest knowledge explodes the possibilities for us tounderstand more about the awesome gift we have been given in life and have a chance to live with God when the war is over.
The powers satan has as a being was very powerful before Christ took from him the keys of life and death, but unbelief still allows him to operate until all things are resolved in a final battle over Jerusalem and the Holy land, as we see this happening before our eyes every night on the news.
If your seeking truth, study, in depth, the Bible. The prophecies alone are amazingly accurate, not to mention the portrait of man's condition, of the sin nature, and death. As Daniel and John foretold, a new Israel has appeared in history to lead us into the end times, and the focus of the world has gone back to where it all began and will end with the enemies of God gathering force for final chaos.
I encourage you to seek God with all your heart and strength. I pray that your efforts will lead you to enlightened understanding, not darkened by the lies and pride of satan and the deceived he inspires.
Eph 4:18 Having the understanding darkened, being alienated from the life of God through the ignorance that is in them, because of the blindness of their heart:
IMHO - peace