How is called that belief?
I don't even know if a religion exists for this, but I don't know where else I could ask.
How is it called when someone believes that everything exists and doesn't exist simultaneously? I believe that everything exists and doesn't exist at the same time because I believe in the multiverse, that there's an infinity of realities (and multiverse), where things can happen in one, and other things can happen in another.
For example, I believe that every religion exists, in a reality (and/or multiverse), Christianity would be the truth, and an another one it wouldn't and the truth would be pagan religion, and in an another reality there's no religion that is true.