Try measuring something without believing it exists and see how far you get.

Ok.

:reads his horoscope, takes an IQ test, speaks to a reiki healer, analysis of the fungi shei of his bedroom, using a dowsing rod, and gets his thetan level checked.

What do I win?

Belief is a binary so it’s not like you can neither believe nor disbelieve in the thing you’re measuring.

Assertion please prove this.