How do you know what could happen?
You have assumed God caused only one cause, the first one. You have assumed that one cause begat all other causes and did not do so in only a generalized manner but also in a meticulous manner such that the cause of your post and my post is directly, not indirectly caused by the first cause. You have also denied the possibility God could/can and according to scripture, has added subsequent causes. Now your views do fall within the category of theology known as Calvinism, but meticulous determinism is an extreme version of monergism, much like Pelagianism is an extreme form of synergism.
Yesterday I was reading an article on the classical Augustinian/Calvinist view of divine foreknowledge I think you'll enjoy reading (even if you still disagree after doing so). Unblessedly, I do not have time now to type it into a post and I cannot find an
online copy. I'll quote some of it when I have time.I can, for now, use an analogy he employees to illustrate one relationship between foreknowledge and causality.
Suppose you and I were walking along a path on the edge of a mountain and either one of us kick loose a rock that falls downward through the air, or one of us deliberately throws a rock down the side of the mountain. In the first scenario neither one of us may know the rock has been kicked loose, but we might. If one of us deliberately throws the rock then we know that has been done. What, then is the outcome of the rock's fall? Neither you nor I know. Because of the way God designed the earth the rock will normally, ordinarily fall vertically and, assuming no one is beneath the rock's path the rock will stop its fall when it strikes the earth below. There are some ordinary influences on the rock, such as the rotation of the earth and winds (or rain if it is a rainy day), but otherwise the rock falls in a direct line and hits the earth below and he can assume that's what happens but we have no actual knowledge of that event having happened. In other words, we believe the rock hits the ground with knowing it has actually done so. Perhaps it hit a bird that just so happened to be flying below and hitting the bird altered its path, along with a particularly strong blast of wind the bird was enjoying that continued to have unusual effect of the rock as it continued its fall after hitting the bird. Both of those influences would "natural." Suppose, however, that God had a specific plan for that rock, and He wanted it to strike a person below, but the natural course of events would not otherwise see that rock strike that person. God could do any number of things to make that rock hit that person. He could hasten the footsteps or inhibit the footsteps of the person. He could create an especially forceful wind that forcefully alters the course of the stone to insure it strikes the person. He could do both and much more but His entering the otherwise ordinary cause-and-effect first created by the first cause of creation to created additional influences or forces (like a hastened footstep, a particularly strong wind, changing the temperature, or creating a bird for that purpose) would be additions to the first cause. They would be new, different, and unrelated causes.
Jonah 1:17 KJV
Now the LORD had prepared a great fish to swallow up Jonah. And Jonah was in the belly of the fish three days and three nights.
And although I might argue forcing a fish to swallow Jonah and dumping on the beach of a town to which he'd refused to go is violence to the will in a post-disobedient world, not a single act on God's part in the above analogy need do any violence to any act freely chosen by the human as far as what was ordained from eternity. To think of creation is as a single line of cause and effect is simplistic and enormously problematic. It has the paradoxical effect of limiting God to just one cause and either having no creativity (any god can make action figures do what they are made to do) or no other recourse once having created. Both God and creation are much more dynamic than that.