Satan 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. Moses pens in Genesis 1:2 of the King James Version And the earth 'became' without form and void: and darkness was upon the face of the deep. ....
What is the evidence you require as acceptable for demonstration? There are all manner of dino fossils that demonstrates an age before flesh man was put upon this earth. The earth is pocked full of marks that demonstrate some kind of cataclysmic action took place eons ago.
The creation of the universe is itself a cataclysmic action, as are the violence in the initiation and tearing apart of stars, 2 or 3 of which had to evolve before the Sun hence its metal content. Yet such upheaval does not demonstrate Satan but rather the way in which God develops the universe.
Our “expereince” in the universe, such as it is, extends actually some distance as we can see deeply back into the reaches of distance and hence time to some very early instances of creation. God is perhaps most plain in that “nothing comes from nothing”. Yet quantum uncertainty keeps us from knowing its earliest onset. M-Theory suggests that the “multiverse” is like a loaf of bread: cut into slices, each one separated eternally out of contact with the other. The weakness of gravity however, compared to the three other known physical forces operating in our universe, suggests that some sort of transfer mechanism possibly acts between them, which yields the hope that some semblance of that ever deeper aspect of our existence may yet be learned.
God is in these details. Though I can’t prove it, I’d yet lay a considerably higher probability for as against it.
Though still throughout, no Satan. Or at least no evidence for one. It’s possible that some other intelligence in another galaxy perceives of some sort of devil giving rise to the structural problems of its existence as well. But its challenge to demonstrate it outside of its own experience would nonetheless remain the same.
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.