To me agnostic atheists are arguing semantics.
Generally to know something is to possess knowledge of something. Hypothetically, if Jesus's Father was God, you would know God. But then there is the statement that knowledge means 100% certainty, but we understand that NO knowledge of ours (besides of our own existence) is 100% certain. It is all based upon an inductive reason (see David Hume's problem of induction).
So, in the realm of inductive reasoning, it seems a true agnostic atheist would claim that the existence and non-existence of God are equiprobable propositions. And if you have a 50% belief in God, that should make you a theist.
>>3250873
Agnostic Atheism is the neutral position.
Theism is a positive.
Strong Atheism is a negative.