Big difference here is that there aren't multibillion dollar organizations with billions of followers firmly and strongly convinced of the existence of fairies to the point where they want to write laws based on fairy culture and teachings. If I lived in such a culture, I'd probably describe myself as an afairist.

I would not call myself an atheist if it weren't for the fact that theism is thoroughly and deeply ingrained in american culture.

In china, most people are atheists, but they don't really identify as such. It's simply the default. Were I in that circumstance, I certainly would feel exactly the same way.