Jaime Lannister, the Atheist

[Jericho]

But what about R'hllor resurrecting that guy in that cave whose name I can't remember? That was definitely real, was it some other kind of magic?

The only difference between the gods of this world and the gods of GRRM's world is that eventually, GRRM will have to reveal them. Whether they are real or fake, GRRM will eventually finish his books and his universe will become complete. We shall see what he says about his gods in time.