Not even the God of creation can foretell "free will choices"...........free will = free thinking. God can know what you are thinking at any certain time but can't control what you will be thinking in the future. Its detailed in scripture.........unambiguous and obvious, man being endowed with free will creates his own fate when he freely makes choices between right and wrong, evil/good, righteousness/unrighteousness.
One single passaged demonstrates that God did not plan for man to sin. God created man totally and completely innocent and placed him in an environment that would support his every requirement for life and life's necessities. With no law, except one simple law, there can be no sin possible unless you break that one law. Sin did not enter the world until man decided freely to disobey the one rule that would bring about his death if disobeyed. That one rule? "You can eat of any tree in the garden, but you cannot eat of the tree of the knowledge between good and evil." Eve.......being deceived was not accountable for the sin.......it was not until Adam with foreknowledge decided to eat from the tree being the head of the family........sin entered the world.
Why did God place the tree in the garden in the first place? Its really quite obvious. God created man in His image. One of the things this implies (free will) is that man is given a free choice to decide whether to follow God or not. Along with "free will", by necessity comes law.........without law there can be no choice. Right/wrong, good/evil, etc., always exists, but unless we are made aware of the choice through law, we cannot be held responsible for keeping or breaking the law. The reason that animals can't sin, children can't sin.....until they reach the age of reason, they are not responsible because there is no comprehension of the law (i.e., the tree of knowledge between good and evil).
Eve was deceived.........Adam was not, he chose to follow the advise of his wife instead of the only law he was to obey. Being "one flesh" though marriage.....both paid the price for breaking the law of God.
As far as knowing that free will exists and God did not plan for man to sin, one passage confirms that Sin was not a product of predestination by the God of Creation. "And God saw that the wickedness of man was great in the earth, and that every imagination of the thoughts of his heart was only evil continually. And it repented (turn away) the Lord that He had made man on the earth. And it grieved Him at His heart." -- Genesis 6:5-6
If one has foreknowledge ..........one can't be sorry when that knowledge becomes reality.