Determinism is a quasi religion trying to give humans the illusion of control.

I mean what would happen to human belief systems if the universe would be indeterministic by nature?

It would remove mankind from the center or the top. Most belief systems are build around humans not the universe and as such most likely doomed, including socialism.

And if there is a god, he didn’t build the universe down to the Planck layer but out of it. The Planck layer (length+time+X (=strings?)) is defining the universe. It’s more like a canvas … no canvas no image … no Planck layer no universe/reality.