I kinda understood this from the movie Mr Nobody https://www.imdb.com/title/tt0485947/
My counter to this is possibly that this is just how space-time / consciousness works, or just how god made it work for those that haven't found the "path" to heaven, or the true exit.
When you outline "all will happen" theory, how can you dispel the theory a god emerges at the end of time, similar to a fetus in utero. Which would suggest god reproduces or becomes the eventuality of ALL. If all will happen, how can we not acknowledge it already has and created a god that figured out how to exist outside space-time?
If a god did do this, how would he not be alone and want a companion? How would a god create a true companion and not just a robot doing as it's told? Give it a test where it believes it won't last forever and see what it comes up with on its own. Except how do you tell? This timeline theory fits to suggest we can live forever in a world of our choosing, or if we choose to believe in the same things as the creator we can find a path out, which will grant us supreme abilities including the ability to return and effect change beyond that of life stuck in the multiverse.
I had to stop smoking for weeks to be able to articulate this