Continuing to insist that this is the case does not make it true. Since the vast majority of self-identified atheists do not use your definition, you will constantly be creating straw men to argue against. As someone that is familiar with debate, you should know that the first goal in any discussion is to agree on terms and definitions, otherwise there can be no progress made on substantive matters. You're welcome to proclaim that atheism is a positive claim that a god doesn't exist but just be aware that it will not be productive discussing any issues with actual atheists that don't proscribe to your definition.
There are only two positions on belief of a concept. One either believes or he doesn't. My claim that a purple dragon lives in my garage, is countered by a lack of acceptance of that claim, not a new positive claim that dragons don't exist. Likewise, theists believe in a god or gods. Therefore the contrary position is one of no belief in god or gods, NOT a different, brand new claim that gods cannot or do not exist. It is much like our courts where a verdict of not guilty does not mean that they jury thinks the accused is innocent. A juror may indeed believe that the accused is innocent but that's not what the not guilty (atheist) position states, only a rejection of the guilty verdict.
The theist/atheist terms has nothing to do with knowledge so agnostics can be either theists or not theists, i.e atheists.
When I reached intellectual maturity and began to ask myself whether I was an atheist, a theist, or a pantheist; a materialist or an idealist; Christian or a freethinker; I found that the more I learned and reflected, the less ready was the answer; until, at last, I came to the conclusion that I had neither art nor part with any of these denominations, except the last. The one thing in which most of these good people were agreed was the one thing in which I differed from them. They were quite sure they had attained a certain "gnosis" — had, more or less successfully, solved the problem of existence; while I was quite sure I had not, and had a pretty strong conviction that the problem was insoluble.
So I took thought, and invented what I conceived to be the appropriate title of "agnostic." It came into my head as suggestively antithetic to the "gnostic" of Church history, who professed to know so much about the very things of which I was ignorant. To my great satisfaction the term took.
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Agnosticism is not properly described as a "negative" creed, nor indeed as a creed of any kind, except in so far as it expresses absolute faith in the validity of a principle which is as much ethical as intellectual. This principle may be stated in various ways, but they all amount to this: that it is wrong for a man to say that he is certain of the objective truth of any proposition unless he can produce evidence which logically justifies that certainty
These quotes by Huxley demonstrate that agnosticism is not any claim or beliefs about god or gods but about whether one has knowledge on a subject. Having no theology is not an untestable claim because it is not a claim to begin with.
Being agnostic does not mean you don't have an opinion on a subject. That's ridiculous. Quit changing the meaning of things to suit your agenda.Until you can produce,as requested, a quote from atheists that any of them have claimed to have knowledge about the lack of gods, this assertion of yours will continue to stink as most shit does.
You once again confuse my frustration of you as lack of having a handle rather than the righteous annoyance I have with you for continually misrepresenting my theological position. If I said that as a polytheist you must also believe in pink unicorns that fart rainbows, you would rightly be able to tell me that's not your position. However, here you are telling all of us self-identified atheists that we believe something we do not.
I have no idea other than some agenda-driven reason why you would continue to insist that we aren't correct in calling ourselves atheists if we don't take the positive claim position. If you can enlighten us as to why you want to misrepresent the position of lack of acceptance of the theistic position, by all means tell us.