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But He can. God is omnipotent, as well as omniscient. Do you honestly think that a mere contradiction in the petty English language (of which the original text was not even written in) is going to stop He who can create energy and matter from a vast expanse of nothingness?
Let us here hypothesise upon the outcome were He to not have placed the tree in the garden.
If He hadn't placed the tree, then He would have been doing so to protect us from our own folly. As logically follows then, He must be forever afterwards obligated to protect us from all potential folly that was to come. In essence, He would have had to lock us within the garden for eternity and deny us any resemblance of free-will to choose our own lives and to learn from our mistakes.
But God loved His creations, and did not wish them to become emotionless slaves within His house. So He, in all His mercy, gave them a choice, even though He knew which one they would choose. He did not create the sin, but merely prevented it from happening, such that His children could live far better lives.
Think of it like a father whose young child desires to buy their own home and move out of their current abode with the father. The father knows that the child will not be able to make it in the world on their own, but still allows him to, with the promise that he will love and support them, no matter what comes about. When these bad things do happen to the child, the father looks on with pity and remorse, yet knows that his child is free to choose their life and will always be welcomed back into the house of their creator, so long as the child can humble themselves in order to make such a choice.
It appears here that you are taking the Bible literally. But to me, Satan represents only an idea. He is temptation and sin personified, and it is only through man's baser nature that such an idea is even possible.
Whilst God undoubtedly shines as the source of all light, Satan is not the source of darkness in this world. He is merely the name given to it. For darkness is only an absence of light, not a seperate entity, in constant battle with it. Darkness only comes about when we humans turn away from the light offered to us and instead start staring at our own shadows.