Except that what you don't believe is irrelevant, moot, and illogical to assert.
There is no way for you to know this, yet you clearly believe it, and are adamantly asserting it as the truth. So why are you lying and claiming that you have no belief regarding the nature or existence of God when you so obviously do?
And you would be lying then as well. Because you would just as clearly have beliefs about them, and make assertions of truth based on those beliefs, as you have about God.
But no one asked you about any stories, or even about what you believe. The question was not that specific. The question posed to you, by theism, is; "does God exist?" It's about the conceptual existence of a God or gods. And the same with Santa Claus. The question is not about what you don't believe, it's about the conceptual existence of Santa Claus.
"You believe "Santa" is:____, you believe God is ____, you believe this about each, ____, and so on. But you don't "unbelieve" anything. Because a lack does not exist as anything BUT a belief.
That's because you are jumping directly into your bias regarding the stories, and not stopping to clarify the concept that is being posed toy you, and the question that you are being asked to consider.
None of this has anything to do with the proposition that God exists. Stories are stories, they exist as stories. The characters in the stories exist as characters in the stories. The ideals the stories convey to us also exist as ideals in the minds and hearts of human beings. But none of these things ARE GOD. They are all conceptual representations intended to help us gain some concept of what God might be, and how God might interact with us, if God exists. They are only tangential to the proposition that God/gods exist. And to your answer to that question.
I agree, but that would require that we stop jerking our knees every time the term "God" is used, and some in depth consideration be given to clarifying exactly what this god-concept entails, and how it relates to our own experience of existence. Sadly, that isn't the case with most people.