God knew what good and evil was, so did angels, so did people, everyone has ability to choose their own path, if you chose evil path it is your fault and yours alone. What you doing now is blaming God for creating evil path whereas it was you who chose to walk it. I don't mean you personally.
But the Bible says in Lamentations 3:37-38:
"Who has commanded and it came to pass, unless the Lord has ordained it? Is it not from the mouth of the Most High that good and evil come?"
You want Satan to be humanities Judas-Goat, it's all his fault that we are tempted to evil.
If I leave a loaded gun on my table and my child shoots someone with it, I am the on who should be blamed. I was the greater power and authority, and I failed my child.
Why is God blameless if He created temptation and his children were tempted? At least Pandora's box was intended to be a punishment, the Gods gave it to the humans with instructions not to open it (sound familiar? Eat of any fruit but the fruit of the trees of Knowledge and the tree of Life?) But the intention was that it would be opened and the pestilences released. By creating the trees, and placing them in the middle of the garden, God set up man to fail.
Of course here is another contradiction in the Bible.
What was the punishment for eating "The Apple"?
They were cast out of Eden and exposed to sickness and Death.
Why weren't they supposed to Eat of the tree of Life?
And the Lord God said, Behold, the man is become as one of us, to know good and evil: and now, lest he put forth his hand, and take also of the tree of life, and eat, and live for ever:
So death was in the plan from the beginning, life was not meant to be eternal.
Oh and While I'm in Genesis,
16 And the Lord God commanded the man, saying, Of every tree of the garden thou mayest freely eat: 17 But of the tree of the knowledge of good and evil, thou shalt not eat of it: for in the day that thou eatest thereof thou shalt surely [5] die.
And the serpent said unto the woman, Ye shall not surely die: 5 For God doth know that in the day ye eat thereof, then your eyes shall be opened, and ye shall be as gods, knowing good and evil
So who tells the truth, and who lied?
Give you a hint:
And the Lord God said, Behold, the man is become as one of us, to know good and evil: and now, lest he put forth his hand, and take also of the tree of life, and eat, and live for ever:
And I thought lying was a sin.