Disbelief is a form of belief. On the spectrum of faith, it is refusal of the thing.

Choosing to not believe in something is disbelief. Not believing in something choicelessly is not.

How could a child express disbelief in something they have no knowledge of? They cannot believe or disbelieve in it. They don't know what it is. The spectrum is non-existent for them, literally. They cannot align themselves on whether something is true/real or not because they don't know what the thing is yet. They cannot be an ist in ANYTHING without knowing what the prefixing topic of the ism is.

There are no insults, so that's affirming news to me on your position. Thanks for calling me a man. Good luck with your interpretation of English and ideologies, but don't expect the world to change for you any time soon.