Hi! I’d like to make a few comments on your post:
The classic fatalism argument, when applying to God, is that:
1,If God knew, before creating the universe, that God would create the universe, then it was not in God’s power to NOT create the universe.
2, If God doesn’t have the power to change the occurrence of creating the universe, then God does not have free will.
3, God is omniscient (all-knowing), and therefore knew before creating the universe that God was going to create the universe.
4, Therefore, it was not in God’s power to change the occurrence of creating the universe. (1,3 MP)
5, Therefore, God does not have free will. (2,4 MP).
The first thing I want to talk about is that, premise 3 of the classic fatalism argument does not apply to God. We may think that, because God is all-knowing, God knew since a long time ago that we would do X at T. To us, things that will happen in the future are pre-existed, long before their actual occurrences. However, it is not true to say that God also knew what He would do before doing that. The reason is that, time is created by God, therefore doesn’t apply to God. Which means, in other words, God is not limited by time – what we think to be “the future”, might be just like the present to God. Therefore, the “foresight” part of God’s omniscience, because of its relevance to time, applies only to humans but not to God.
Also, same as you, I don’t agree with what premise 2 describes. It seems to me that, “to have power to change the occurrence of something (at T)” is a baffling thing to say. What we do, or what happens at T, is what’s final and that doesn’t change. For example, right now, I either sit here to finish writing this, or go out for a walk, no matter which one occurred, it is what happened. Does it then mean that right now, I do not have free will because I can’t change what happened? No, because our free will doesn’t hinge on “ the power to change something’s occurrence”, but on when we’re doing something, whether or not we are restrained by someone/something else. That is, whether I choose to continue to write or not is up to me, myself, not others, so I do have free will on this. The situation of God is similar. God does not change, and God never changes, however, He is completely free, because He decides His actions, not something else decides His actions for Him. If God wants to create the universe, he creates the universe, and that is God’s free will.