Given that Martin has repeatedly said that the existence of any of the gods in the series will never be confirmed--he's been pretty adamant that the ambiguity about which gods are real, or if
any of the gods are real is important--I think it's fairly unlikely that anyone turns out to be a god.
Prophesy, on the other hand, is common (if ambiguous), and magic--whether it comes from gods or is only perceived to--clearly exists. If you're expecting R'hllor, the Drowned God, the Seven, or the Old Gods to come down from the heavens and intervene at some point, you're probably going to be disappointed.
Spoilers for AFFC and ADWD:Reading between the lines through much of the material in A Feast for Crows and A Dance with Dragons, it's becoming clear that Martin is interested in the struggle between the sciences and the occult. A number of Sam's chapters revealed that most of the Maesters in the Citadel hold disdain for studying magic (which is why most do not have that link on their chain).
It is strongly implied throughout the series that the presence of dragons in the world is related to the existence of magic (note, the sorcerers of Qarth said as much and it's only since Dany woke dragons that the red priests have been able to wield real magic; in the first book when Thoros of Myr participates in the melee with a flaming sword, the fire destroys eventually melts and destroys the sword). It is also strongly implied throughout the series that the Maesters' order was largely responsible for the death of the last dragons.
AFFC sets up a lot of trout in Oldtown, the Maesters, and the septons; Ja'qen's presence as a spy in Oldtown, moving a major POV character down to Oldtown (Sam), and the importance of Cersei's mistake arming the church are not all coincidence. Martin is setting up some big things to happen down south, and I'm willing to bet that a good chunk of it has to do with setting the maesters and the septons up against blasphemous magic.