Cash has value because the government, which is a real thing that verifiably exists and has power because of collective decisions made regardless of whether you agree with them, demands that you pay taxes and will put you in prison if you don't.
What verifiably happens to me if I don't pretend I believe your particular god exists?
What gives a government legitimacy and power to extort taxes and punish people? Collective acceptance and trust, nothing else. Same goes with religion.
> What verifiably happens to me if I don't pretend I believe your particular god exists?
Used to be not that long ago that you'd face similar punishment. It's fairly recently that religion as a social institution has weakened to obscurity. If you attack its symbols, you attack its society.
And how many governments claim no other country or currency is legit and anyone who isn't their country is a blasphemer or at least seriously misguided? Does French government say Germans are fundamentally wrong, the German government should be dissolved and every German should be French?
Show me which government claims cash came from outside the universe and the govt itself invented the universe and is omnipotent and can read everyone's minds.
What verifiably happens to me if I don't pretend I believe your particular god exists?