The topic about free will is similar to debating “are we in a simulation?”
In a perfect simulation, there is absolutely no way to escape it. A simulation is essentially like a virtual machine running some opcodes. There is absolutely no way to escape it unless the programmer is shit at implementing the opcodes with buffer overflows.
If we cannot computationally reduce, we have no option than to let the simulation play out. So far our universe is not computationally reducible. I.e we cannot compute where subatomic particles will be faster than letting them actually play out.
Whether we have free will or not doesn’t matter. If we cannot computationally reduce, person B cannot compute ahead what person A will do with absolute certainty.
To compute the future, we need to simulate every subatomic particle in universe faster than the the natural speed of universe with fewer particles. That itself is impossible.
We can approximate, yes! But not absolute certainty.
So we have no free will because universe is deterministic. But we also have free will because we need a universe sized computer to know what will happen and the only way to do that is to let the universe play it out. We cannot do that faster than the universe if we are inside the universe.
We are in a simulation. But it does not matter because it makes no difference if we are in a simulation or not.
God exists, but God also doesn’t exist. If God is non-interfering then it absolutely doesn’t matter.