.................................................................................................*head explodes*
Christmas and Santa Claus both appropriated certain pagan traditions, but they are most certainly not pagan in origin in the way that they're celebrated in the US (and hence the way they're celebrated in The Nightmare Before Christmas).
Just... look at the names, okay?
Christmas (Christ Mass!).
Santa (Saint!) Claus. You can't use those names without Christianity being there, because they rely heavily on Christian tradition to make any sense at all. You can have Yule and Odin or the Krampus, but you can't have Christmas and Santa Claus without Christianity. -_____-
...granted, replacing Santa with Odin-the-summon would be kind of hilarious. xD But that's not really the point.
...um?
That entire song is a prayer. Esmeralda's doubts come as much from the fact that she's a Gypsy and she's not "allowed" to pray than anything else ("I don't know if You would listen/To a gypsy's prayer/Yes, I know I'm just an outcast/I shouldn't speak to you"), but the
point of that song is that, even with all her doubts and even as an outsider, she has a better perspective on praying than the people who take it for granted. There's a pretty extended portion of the song devoted to that, actually ("I ask for wealth/I ask for fame/I ask for glory to shine on my name/I ask for love I can possess/I ask for God and His angels to bless me" -> "I ask for nothing/I can get by/But I know so many/Less lucky than I"), whereas Esmeralda only questions whether God is there in one line out of the whole song.
Believe me, Disney never would have made that sort of implication in that movie. They already changed an incredible amount of stuff so as to not be offensive to Catholics (eg.
Judge Claude Frollo); they wouldn't turn around and say "God doesn't exist" after making that kind of effort. =P
Well, that's why I brought up
Deism. Deism doesn't really worship any deity, but simply believes that one exists that created everything, then stepped aside to let the universe run on its own. It wouldn't seem out of place for Kingdom Hearts itself to fill in that position.
From Xehanort's Report 4:
"And when Kingdom Hearts is complete, it is said the one who opens its door will bring about the creation of the Next World. Such a feat is above any human. Or, to put it a different way: whoever opens that door will be reborn as something far greater than human."
Creating the "Next World" feels like a religious concept to me -- or, at the very least, every example I can think of for such a thing comes from religion.