As Man did not make himself, and had neither act, nor voice, nor suggestion, nor choice in the creation of his own nature, Man cannot be held answerable for the qualities or powers of his nature, and therefore cannot be held responsible for his acts.
If God made Man, God is responsible for the qualities and powers of Man's nature, and therefore God is responsible for Man's acts.
Christian theology is built upon the sandy foundation of the doctrine of Free Will. The Christian theory may be thus expressed:
God gave Man a will to choose. Man chose evil, therefore Man is wicked, and deserves punishment.
The Christian says God gave Man a will. The will, then, came from God, and was not made nor selected by Man.
And this Will, the Christian says, is the "power to choose."
Then, this "power to choose" is of God's making and of God's gift.
Man has only one will, therefore he has only one "power of choice." Therefore he has no power of choice but the power God gave him. Then, Man can only choose by means of that power which God gave him, and he cannot choose by any other means.
Then, if Man chooses evil, he chooses evil by means of the power of choice God gave him.
Then, if that power of choice given to him by God makes for evil, it follows that Man must choose evil, since he has no other power of choice.