I think the Rhllor thing boils down to a combination of faith and sacrifice.
Priests/priestess with great faith in Rhllor can perform miraculous things (as with Thoros and Beric). When a great sacrifice is made to feed the god's power (ritual blood sacrifice), the priest/priestess making the sacrifice gets some of that power.
If you've been reading the books, there are a lot of indications Melisandre has been misinterpreting her visions - seeing Stannis when actually it's Jon Snow. So her power being used to res Snow is actually just in line with everything she's been seeing (but not seeing).
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