Now, the loftiness of power requires that there be produced creatures that are not only traces, but also images; creatures not only irrational, but also rational; creatures moved not only by natural instinct, but also by free will. Moreover, a creature made to be the image of God is by that fact capable of possessing God and hence is called to the beatific vision; a creature that is rational is capable of distinguishing the truth; and a creature possessed of free will is capable of ordered or disordered actions in terms of the law of justice.
Image, if you will, a creature without free will claiming to be in the image of God. Yes, while we can wrestle with what it means to have free will, we have to understand that this is what the image of God means. Are we merely minions of God, His pawns in some cosmic chess game against Himself?
Admittedly, I do not believe in free will in many ways, yet I do not believe in determinism either. Either we chose to worship God or we do not (yet). Either we are rational (which, by the way, means we have a sense of right and wrong) or we are not and thus not bound by any sense of morality.