Neither does pure materialism rest on falsifiable beliefs, in that I could claim nothing exists outside my conscious experience.
If ten years from now your phone tells you it is conscious, would you believe it? What criteria would you use to decide?
If we go falsifiability, again, I can equally say how do I know your concious, or even that how do I know youre alive and breathing beyond the moments that I myself am observing you?
This is an metaphysical discussion, so falsifiability is kind of irrelevant. All metaphysical positions are ultimately unfalsifiable - including materialism and physicalism just as much as dualism or monism or theism.
This is not true, there are many metaphysical positions that are falsifiable.
For example, "anything shaped like an apple is an apple" is a metaphysical position. It defines what it means to be apple-ish. You could hold that metaphysical position and also "apples are always made of plant material" as another position you hold at the same time.
Then you could falsify the metaphysical position by presenting a stone carved into the shape of an apple. You could choose to deny reality and change your physical definition (what the definition of the word "apple" is), but if you think logically the evidence constructively falsifies the original metaphysical position.
I think what you might have been trying to say is that people tend to adopt metaphysical positions which are non-falsifiable. Yes, they do, but that doesn't mean no metaphysical arguments can be resolved through logic and experiment.
So yes, some metaphysical statements are falsifiable, and some have in fact been falsified over time. And, very importantly, many of the biggest metaphysical questions have no known falsifiable answers (at least none that are not already known to be false, of course).
If souls can influence the world, as is the common belief for souls, then in principle that influence or its absence can be detected.
https://en.wikipedia.org/wiki/Twenty_Cases_Suggestive_of_Rei...
EDIT: Downvote all you want, materialists, but reincarnation is the spanner in the works nobody wants to confront ..
If you believe in reincarnation, for some reason brand new souls are spawning into existence. Why? How does reincarnation work for them?
Because souls split. Like rain and the ocean.