Indeed, you could argue that one doesn't need to, but you would make a really strong argument if you prove it on the quantum level ;) You said that there is no deterministic universe, what would be your argument for that? I'm not arguing for the existence of superdeterminism, I'm just curious about your argument :)
Also, I think you are referring to quantum entanglement? Spin can be defined for a particle, and you consist of particles, do you mean, if someone set the spin of one of your particles, to the spin of some other particle belonging to someone else hundred miles away?