I consider agnosticism to be more neutral than that. I consider myself an agnostic purely on the basis that we have, as yet, to obtain any knowledge with regard to the existence of a deity. I don't hold that such knowledge itself cannot exist, because that's a conclusion that relies on the logical fallacy that not having such knowledge now precludes its existence in the future.
I think atheism can have a system or structure of beliefs around it. I think often atheists have constructed such perhaps without even realizing it. But atheism doesn't necessarily entail a belief system, nor do I think most atheists are particularly interested in one.
I do, however, find some amusement in the fact that this thread seems very active on the topic of atheists and their beliefs or lack thereof, when
if atheists actually lacked specific beliefs related to their atheism, this thread would have warranted a post or 2 and then died a quick death