LOL, I agree.
But isn’t the burden of proof on the one claiming the existence of the non-tangible spirit? If I said instead of one “spirit”, every individual would release a number of “spiritlets” after death, there is no way you can contradict me, by your own logic regarding the existence of the single spirit. When we deal with the realm of the absurd, anything goes. Zero multiplied by any integer, is zero.
There is nothing for me to prove to a speck of dust that is void of destiny. Sorry for the gap in time. Nature calls.