Not true. Do you not understand "Natural Law"? I would suggest you read C.S. Lewis' Mere Christianity and you will see that you statement cannot stand up to a close examination. Man is born with a knowledge of right and wrong placed there by God. It is part of a person's soul and is what makes man different from the rest of God's creation. Did not Adam know right from wrong, and yet chose to disobey. Certainly you are no going to say that God predestined Adam to sin, for to do so you would have to admit that God was responsible for Adam's sin. Why would God create man with a nature that would permit him to choose to sin? The answer is obvious. Without a free will, there can be no love relationship, and isn't that the reason God created man?
Are you going to say that Adam's sin was a surprise to God...that He was not prepared for it??