Agnostic here and from what I read about these religions I'd be Agnostic there-is there a Known World term for it? BTW there are some in the Known World right?
Davos is portrayed as one on the tv series I'd say ,is he in the books?
I'm only on the 2nd book, but Davos worships the seven. He specifically says he prays to the mother, warrior, and I think the smith for various different causes. He doesn't seem like the most religious person, but he definitely considers them his gods.
What I find interesting about the religious beliefs in Song of Fire and Ice is that people seem to acknowledge the existence of all the gods, and just choose to worship particular gods/follow particular faith. (i.e. Cat Stark seems acknowledge the Old Gods even though they are not
her gods. Same is true for other characters) In the seven kingdoms people even swear oaths to old and new gods, regardless of which they worship. So (at least some) people believe in all gods, and just worship their own. They only exception I can think of might be followers of the Lord of Light.
Anyways, I went with the Old Gods. Mostly because I relate to/sympathize with the North. I think they'll come out ahead in the poll since the Starks make up a majority of the 'main' characters, and are pretty much universally liked. Plus, I like the woods.