I strongly suspect that this is God himself. Otherwise it undermines monothesim. And God has to have a being made "in His image" that can make choices. Otherwise there would seem no point to have made that being.
The response above came from my post ...the serpent had to have gotten that knowledge of good and evil he whispered into Eve's ear before he involved her in his seduction.
IF we did not have the WORD from Isaiah 14:12--- and Ezekiel 28:12---- describing in detail about Satan's creation, appointed office and rebellion, followed with him being the only named entity that has already been judged to earned the death sentence, which Moses notes in Genesis 1:2 then I would consider the notion. And the rebellion was that Satan in his role as anointed cherub that covereth stopped loving the Creator and decided he would be God, and drew a third of the Sons of God with him in his rebellion... Revelation 12:4.
Solomon tells us in Ecclesiastes that we in flesh cannot/do not remember the former things. And that the things that hath been it is that which shall be.... Chapter 1: 9-11
The Heavenly Father could never undermine Himself, but He did/does expect and require His creation to treat Him with the love, reverence and respect He is. And this human in flesh 'age' (most often times translated world) is opportunity without full recall of what took place when Satan rebelled for those with 'free will' to choose. Paul says some did not follow the first rebel and they were predestined to do particular tasks.... Moses, Abraham, Issac, Jacob, twelve sons, David, Isaiah, Jeremiah, Ezekiel, Daniel, etc....
Obviously Satan as was called Lucifer made a choice and yet before his death sentence is carried out is allowed to replay that role as God to allow the children of the Creator to pick which God they will put their soul/spirit trust/faith
As I type this I am reminded of Alinsky's dedication to that first rebel who earned his own kingdom.... for a short time.