[sciolizer]

Do you believe god exists and has a psychology? I'm trying to understand if you have trouble believing because you don't think god would create such a universe, or if you have trouble believing because such a universe is innately unbelievable.

If the latter, then I would ask, "Do you believe the ocean is deep, even though you can only see the surface?"

[ploxiln]

The latter.

I don't really understand the ocean metaphor, since humans have seen below the surface, quite a distance with remote-controlled submersibles.

[sciolizer]

Perhaps a better analogy would be, do you believe that matter exists beyond the observable universe?

Because of the expansion of the universe, it is theoretically possible for me to get in a space ship and travel away from you at such a high speed that we would never be able to meet again, even if at some point we both decided to head back toward each other as fast as possible, and even if we were both immortal. Our light cones would no longer intersect.

Probably you would assume that I continue to exist, despite that for all intents and purposes I cannot affect your life in anyway and therefore "don't" exist.

Similarly if I crossed the event horizon of a black hole.

I believe that a qubit is in superposition (i.e. exists in multiple miniature "universes"), because that theory produces results that are consistent with experiment. When the qubit's universes de-cohere with mine, such that for all intents and purposes I can now only ever observe the qubit in one particular state, why should I assume that the other universes have ceased to exist? Decoherence is a continuous process, just like traveling outside of a light cone, so why treat them any differently. It's rather arbitrary to say that increased distance in space preserves existence, while increased distance in phase space does not.