> you can't be an agnostic atheist, it's an oxymoron
You're wrong. Gnosticism is concerned with whether we can have knowledge of a creation entity.
agnostic atheist = rejects the various religious explanations of how the universe works, and thinks that even if there was a creation entity, humans wouldn't be capable of having knowledge of it, or be made privy to it.
gnostic atheist = rejects the various religious explanations of how the universe works, and thinks that if there was a creation entity of some sort, it would actually be 'knowable' - we could gain knowledge of it, or it would make itself known to us.
agnostic theist = accepts one or more religious/spiritual explanations of how the universe works, but thinks that humans are not capable of having knowledge of a creation entity. This is someone who likely has a woolly, new-age idea of god as some form of energy or an inter-dimensional being which has no interest in making itself known to us.
gnostic theist = usually accepts only one religious/spiritual explanation of how the universe works, and they think they know either the creation entity itself or a demiurge (Eg. Christianity, Islam, etc). Some gnostic theists may believe in a currently unknown entity, but think that we may someday uncover and have knowledge of this being.
The use of the word 'agnostic' is wrong if the intention is to suggest that 'atheists state there definitely is no god, but agnostics say they can't be sure there is no god, and so are more accurate and reasonable people because they don't say (my) god definitely doesn't exist'. That is a crock of shit regurgitated by ignorant religious people. These misconstrued labels are tools which have historically helped the religious to attack and marginalise those who rejected their ideas. This bullshit use of 'agnostic' is a religious attempt to make it seem like atheists are thinking in unreasonable absolutes and extremes, when in fact the only people who deal in absolutes are the fucking religious themselves.
Atheism, as defined by atheists, is the rejection of specific religious explanations of the universe. Atheism makes no claims in itself as to whether a creation entity is possible or impossible, likely or unlikely. Atheists may have individual opinions about possibilities or likelihoods, but that's got fuck all to do with the fact of their atheism, which is simply that they've heard the extraordinary explanations of the religious and have rejected those unevidenced, ludicrous claims.
In fact, a christian, exactly like an atheist, rejects about 279 gods of creation: Zeus, Brahman, Mbombo, Ptah, Nanabozho, etc, etc, etc. The only thing that divides these two people is that the christian arbitrarily throws away their logic and accepts the 280th one, whereas the atheist rejects this entity for exactly the same consistent reasons for which the others were rejected.