Actually the more I think about it, the more it makes sense that it will happen. GRR Martin has already had "bad" characters (Jaimie Lannister for instance) make heroic turns. It's time for one to turn heel. She's freed lots of slaves, but butchered thousands of free men in the process and could leave a ton of death in her wake.
Agreed, a heel turn for at least one of the "main" characters will happen. I actually think Arya is another candidate for a turn. She's just way too young to be obsessed with killing people. She has this list of people who she thinks are responsible for her family's tragedy, and when you see her recite that list while falling asleep like other people counting sheep, it comes off as very, very creepy. Most importantly, some of the names on that list have done absolutely nothing wrong, like the Hound, for example, or Ned's executioner, Ser Ilyn Payne, who just did his job. It's not like the royal executioner can disobey his king's orders just because he disagrees with them.
I don't think it'll be pure black and white, but the actions of R'hllor's worshipers seem to indicate A. R'hllor is real, or at minimum the Fire Priests have access to some seriously legit magic, and B. He's kind of a ****. Lot of burning innocent people alive to please him. And he seems closely linked to Dany what with her fire imagery and immunity.
On the flip side, the White Walkers seem to be closely linked to the "Other" god Melisandre won't name, and have gotten basically 0 non-pure evil characterization. It would be just like the overall narrative to have the god that appears to be on the side of the "good guys" turn out to be more evil than believed and the god that's only linked to the "bad guys" to be more complex and at least to some degree benevolent. That's my thinking anyway - no pure protagonist/antagonist, but good motives turn Daenaerys into a negative force and seemingly evil motives on the White Walker side turn out to be more positive in nature.
Yeah, that was my thought process, too, so I'm inclined to agree. The thing is, which of these things are what R'hllor really wants, and which of them are just what fanatic worshippers (Melisandre) think he wants? There's Thoros of Myr, for example, the red priest with the "brotherhood without banners", who's pictured as a decidedly good-natured and compassionate man, but maybe that's just part of the whole "grey vs grey" dynamic.
Anyway, I'm certain at least one God does exist in this universe. For example, if you read the wiki article about the Grey King I posted earlier, it says he took a mermaid as his bride, so his descendants were able to live on land and under the sea, and there are several instances in the series describing people from certain islands as having fish-like features and webbing between their fingers. There's even a man from the Iron Isles with the name "Dagon", like one of the Gods from the Lovecraft universe, which Martin confirmed was intentional.
More importantly; why do her clothes burn but not her hair?
And apparently that was not a naked body double.
Hodor