In order for there to be free will, there must be objects to chose from. The possibility, or blue print for sin was most assuredly drawn out by God, or He is not soveriegn, nor the Creator of all things, which the Bible states that He is.
Who said don't eat from the tree or you die, satan or the Lord God? Who created the tree of the Knowlage of good and evil, satan orthe Lord God? the blue print of sin was clearly drawn out by God, and placed in the tree that Adam Chose. It was God who cursed the surpent, Adam & Eve, and the earth, for choosing the wrong tree which He created, and mapped out the predestined consiquence for making those choices.
It is idolatry to make up a god to your liking. Sorry your god does not want to take responsibility for the things he does. But the God of the Bible says He created all things. Unless of course sin is not a thing.