Howdy, Sherlock. Welcome, and thank you for stopping by to participate. Glad you could join us.
As for atheism being a “non-position”, I suppose I can sorta-kinda see what you mean and why you might think that. However, it really isn’t entirely accurate. Personally, it simply means I do not believe in any god(s). No different than my not believing in Zeus, Thor, Athena, Santa, the Easter Bunny, or Harry Potter flying on a broom. Would you consider your non-belief in those figures as a “non-position”?
Well, the primary and most commonly used definition (around here, at least) is simply a lack of belief in any god/gods. Nothing too complicated about that. Although, I do agree that a person should specify/clarify if he/she is using the term in a different manner.
Looks to me like you are trying to lump knowledge and belief together as being one in the same. However, whether some folks want to hear it or not, in the realm of god(s) and knowledge nobody KNOWS for certain whether or not god(s) exist. Therefore, agnostic (no knowledge). Regardless of that, though, many (MANY) people BELIEVE god(s) exist. (Hence, theist) Therefore, for a person to identify himself/herself simply as “agnostic” basically says nothing at all about what he/she BELIEVES. (Rather pointless, in other words.)
As atheists (no BELIEF in gods), most all of us (with the usual exceptions) will freely admit we don’t actually KNOW whether or not some type of god(s) exist. That is why it is very important for a person to specify the god in question and describe the defining attributes that make it a god. At which time we will evaluate the provided info and determine the plausibility/possibility of the described god. Of course, that individual would still have to provide convincing evidence to make us BELIEVE that particular god exists.
Gotta go for now. Been a long day. Again, welcome aboard. Looking forward to hearing more from you.