The scriptural definition of sin is "missing the mark".
I think that is true, but kind, for our sakes and to steer our purpose. "Missing the mark" is in fact, cosmic treason.
Agreed. Of course he does. In fact, I have reason to say that God intended that sin be. He predestined that it be.Also, God does not tempt but He did create Satan and uses him to do the tempting.
But the rest of what you reason, to me, is mere reasoning. It doesn't prove God created sin. Does God create our decisions? No, he causes them.