Oh. That is true. It was what I would usually expect if the supernatural showed evidence and the deities of old were real, I'd find it pretty hard to dismiss claims of higher powers then.
but since you're talking about capital G God, if it's supposed to be this transcendent being which can't be proven by evidence, then I guess you can still be atheist magus? Still feels weird because we do have something that's the closest thing to God in Type Moon.