Hmm...

Cute meme, I like it but all jokes aside and just to prevent any confusion or the further spreading of misinformation. I would like to clarify...

A-theism is the position of non-belief. It is a strictly neutral position that makes no claim for or against the existence of a god or gods.

An gnostic is a person that makes the assertion of having special knowledge of a gods existence.

An Agnostic is "without" an assertion of a gods existence.

So an agnostic Atheist is a person who has no belief in a religion or a god and also does not assert that one exists or doesn't exist.

A gnostic Atheist is one who asserts that a god doesn't exist without any proof of non-existence. Very much like a gnostic theist who claims and asserts that a god does exist without proof.