being rational is still a belief in itself
No it isn't. It is a commitment to be led by evidence.
There is always the case where "evidence" isn't totally believed or even explainable.
I am only talking about objective evidence that can be verified by anybody.
That doesn't mean it's irrational just because there is no refutable proof
Believing incredible things without evidence is the very definition of irrational.
If people just want to be honest and say that they believe because of blind faith then good luck to them. If they want to claim their belief is rational then let's hear the evidence.