Einstein's theory is not absolutely correct; it is simply far better than any other theory we currently have, our best current approximation of reality. However, it could be proven wrong at any time. Science, by its nature, is inherently agnostic.
Hell Fast·
可区分性
If you can't distinguish two things, or to some point two things are not distinguishable, simply consider they are the same is a practical way to solve your problems.
Indistinguishability is just unreasonable sophistry
If reality is a dream, but we cannot distinguish it from "reality," does it matter whether it is a dream or not?
If a god cannot intervene in the world to address real-world problems and is indistinguishable from a godless worldview, then the concept is not worth debating.