"Gnostic atheism" is ridiculous.

Wikipedia

Agnostic atheism is a philosophical position that encompasses both atheism and agnosticism. Agnostic atheists are atheistic because they do not hold a belief in the existence of any deity, and are agnostic because they claim that the existence of a deity is either unknowable in principle or currently unknown in fact.

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Gnostic atheism: "I do not know, but I do not believe there is any God."

That's ridiculous.

"I do not know, but I do not believe there is any Easter Bunny."

That's equally ridiculous.

I'm am 100% certain magic god fairies and magic rabbits are not real.

The word "atheism" does not require any adjectives. You are either a real atheist (100% certain gods are not real because they're fucking impossible) or you're a fucking retard.