What's so funny is actually your "reasoning" that just because the metaphysical cannot be shown - gross!
metaphysical and
shown, in the same statement? hahahaha -
that, therefore he doesn't know it (which is again, an illogical statement, because you can know about something even if you can't physically show it).
Kindly set your emotions aside, and review what you just wrote above.
You are in
Philosophy Section - understandably, you'll encounter a lot of
philosophical reflections - (philosophical reflections - does that ring a bell?) Remember the NAS statement above?
Philosophical reflections are beyond science's realm!
We're dealing with the metaphysical (another term for immaterial), therefore.....
show-and-tell, does not apply.
Either you don't know what immaterial is, or your thinking is so convoluted!