Arial Black
Adventurer
In my head Crocodile Dundee said that.
Makes sense though. He hasn't specified exactly how he's going to portray it. I half suspect he's gonna drop the "one true god" line at some stage, which would be cool. Might be getting a bit too realsies for the others though.
This reminds me of an awful bit of comics writing that I read as a kid.
Before George Perez took Wonder Woman back to her roots and re-vamped her, I read a story where WW says something about what the gods thought/would do, and then something about the 'higher God' above even them; a fairly unambiguous reference to the Abrahamic God.
I was appalled, even at that young age! Wonder Woman not only believes in the Olympian pantheon, not only has she actually met them herself, they also gave her her powers.
She also comes from a culture that existed before monotheism was thought of. I'm not suggesting that it's inappropriate for a comic character to be Christian, Jewish or Muslim; I'm saying that it's inconceivable that Wonder Woman is!
If your player's PC were to suddenly spout ideas of a single God that is 'real' while the ones that actually do stuff are not, why would anyone else in the world believe him?
In the Forgotten Realms there is meant to be a God beyond the gods, but he doesn't get worshipped and I don't believe that most mortals have even heard of the concept.
I would view such a sudden statement in a typical medieval-type fantasy world in the same way I would view a PC suddenly making a working fission reactor.