1.) The problem of actions determined by God is not the problem of determinism. There is no doubt we experience deliberation and the consequent free action. If we deny freedom because of mechanical determinism this experience is as meaningless as any other event in the universe. The universe simply fell out in such a way that things have false experiences. If we deny freedom because of divine causality, however, the experience can’t be brushed off so easily – what is the point of God maintaining us in the conviction that we are free when we are not?
2a.) What if we say God maintains nature, but nature is meaningless, so God maintains something meaningless. Isn’t this arguably the point of Ecclesiastes? No, Ecclesiastes calls nature meaningless in the sense that no object in it constitutes human beatitude. The heart sketching nature makes a picture of God in the negative space. The human person is a part of nature in the same way – to take oneself as an end cuius gratia of action is mortal sin.
2b.) To the extent nothing in nature satisfies the will, the will is indifferent to it, and to the extent the will is indifferent it is free.
2c.) So in one sense the freedom of the will is indifference – you grab this object when you might just as soon grabbed the other one. This indifference is of eternal significance, however, when we consider the indifference we have to taking anything as for ourselves as an ultimate end, since to take it in this way makes us ipso facto damned.
3a.) That God is first of all creator means that his action is preserves natures in their integrity and does not destroy them. To imagine God upholds nature while simultaneously thwarting its ends makes omnipotence a perverted faculty.
3b.) A divine perverted faculty would require a composition in one and the same divine act and introduces performative contradictions into perfect operations.
4.) If a free act were uncaused, any putatively free act would be putatively a divine act. Calling oneself free would be a bizzare or blasphemous claim. But this is all nonsense, so we have to allow antecedent causality to free acts. The only question is what sort of antecedent causality there is to a created free act.
5.) Whatever God wills is immutable
God wills all created outcomes,
therefore, Created outcomes are immutable.
The argument is true but the divine immutability as participated in by creatures is not determinism but the necessity of necessary beings, the contingency of contingent ones, and the freedom of the free ones. God is immutable precisely from his perfection, and creatures participate in his perfections so far as they have their own proper perfections. Human freedom and its contingency, no less than the necessity of animal death or the conservation of matter, is the immutability of God as participated in by creatures.
So to re-write the argument with its proper qualifications:
Whatever God wills is immutable essentially and as it exists in God.
God wills all created outcomes as they exist in themselves and as they arise in their proper causes,
Therefore, created outcomes are immutable, essentially as they exist in God, and necessarily, contingently, or freely as they arise from their proper causes.