<<Adam couldnt cooperate with God, and He was created without sin.>>
That is untrue. Adam had a choice, and he chose to rebel against God. If that were not true Adam would not have been guilty of sin.
Denying that we have free will is a major cop out.
When Paul writes: "Wherefore, my beloved, as ye have always obeyed, not as in my presence only, but now much more in my absence, work out your own salvation with fear and trembling. For it is God which worketh in you both to will and to do of [his] good pleasure. ", he's talking about this cooperation which leads to transformation.