Once I realize that I believe in the existence of laws of physics, and that these laws of physics can be found nowhere physically in the universe, I realized I believe in non-physical realms.
Interesting, it was the exact opposite for me. Once I realized that things only exist physically, many things became clear, especially the nature of souls and lack thereof, and of many elements of religious mythos around the world that were invented purely for pedagogical and eschatological reasons and don't literally exist in reality.
I also don't think you're correct about the laws being found nowhere physically, of course they're found physically, otherwise how would we have observed them? I believe you're falling into the fallacy of ignorance, saying that the laws don't exist because you believe they can't be found physically (even though this part is wrong).
It's a decision of axioms. You are free to believe any set of axioms, because they will per definition be unprovable (Gödel et al.), so the word ignorance doesn't quite apply (arguably).
Observing the behavior of fundamental particles following laws is different than touching the laws themselves. Analogous to observing this website is different than seeing the backend code.
Argument from ignorance [0], not ignorance per se. And as far as axioms, sure you can believe anything, but that doesn't not make them necessarily true in reality. I could believe that the earth is governed by an infallible, omnipotent Flying Spaghetti Monster but that doesn't mean His Noodliness exists.
The physical world follows laws that are arguably unknowable (but true, as in there), and it has a history that is arguably unknowable (but true, as in it happened).
Once I realize that I believe in the existence of laws of physics, and that these laws of physics can be found nowhere physically in the universe, I realized I believe in non-physical realms.