I’m not exactly sure that I understood any of this at all. It’s a bit convoluted. But I’ll try to respond.
From point 2. I get from this that you are arguing that, logically, if God is able to perceive all points in time simultaneously, from His perspective, they all exist, yes? However, as we are bound to a specific time, the current one, at least from our own perspective, God does act on and in specific points in time. You then claim that this fact contradicts the assertion that God exists eternally and acts on and in all things simultaneously, as there are obviously specific points that we perceive God’s acting on creation, is that correct?
If I misinterpreted any of that, I apologize. My response to that though, is that God does not act on time while being subject to it. God exists not just outside of time, but above time. Likewise, I think there’s some confusion as to what is meant when God is said to be unchanging. This does not mean that God exists in a static state of no motion, no action, no etc. It means that God’s nature is constant and consistent with itself. He is Love, and will not later be something else. God is, and God is perfect. This does not mean God cannot act on His creation, and it certainly doesn’t render Him immobile or something.
God exists outside of time, which means that God does not grow or develop or learn more. He knows everything, is everything, and is perfect. He is not changed by the progression of time. This does not mean that he is unable to act. God does not exist in some kind of metaphysical “eternal now.” He does not exist in anything. Everything else exists in Him. Time is part of His creation. Time is subject to His will, not to mention everything else in the universe. God does not have to exist inside of time to be able to affect it. Time exists within God’s eternal being. God knows everything not because every moment is simultaneously occurring to Him, but because He has created and willed every moment in existence to exist in the first place. I feel as if you’re looking at it as though God is sitting in a room like in the Matrix, looking at every moment in time simultaneously. That is not so. That is how humans conceptualize existing outside of time, because we cannot comprehend what that would be like. But God does not simply experience every instance at the same time. God is the reason those instances are able to occur at all. He knows all because he already knew it before time even existed.
Truly it is impossible for us to even analogize, because existence within time is all we know. But God knew everything before He created the universe. And I think part of our problem with this lies in the fact that our only descriptions for what happened “before” creation rely on temporal terms and ideas in order to even talk about them in the first place. To God, words like now and before and later are not applicable. He does not act now. He acts. He is. Time is dependent on God, not the other way around.