*points at avatar*
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In the terms of Haruhu as its a fairly popular subject, I'm also more of a Yuki fan than Haruhu.
The movie itself gives you a clue as to how powerful she is; whilst there is an organisation in charge, given my own agnostic bent on religion, I have no problem accepting that if Gods DO exist, that there could be more than one. Certainly, Yuki is at least 'god-like' in her overall powers, and restrictions and deity heirarchies are absolutely nothing new (I mean Roman/Greek god system for example), and a fundamental part of some religions/belief systems, so why you couldn't see Yuki's organisation as another way of labelling such a thing, I don't know