Some physicist believe that nothing can travel faster than light. This theory is unproven as of yet but it is stilled theorized and is accepted in relativity theory. It is a theorized negative position held by people. This idea within physics is a belief because it is an opinion/truth about a thing held by people. It meets the definitions which you quoted.
This would matter if your first assumption wasn't totally wrong.
I am not redefining anything. I directly quoted both sites.
No, you are defining atheism as a rejection of a belief in deities, when Atheism is merely a lack of belief in deities.
Actually yes. When you think of anything, you create beliefs.
Which doesn't help your argument. You just said that you can't have lack of beliefs. If you don't think about it, you can't have beliefs. Therefore you are wrong.
Second, a belief that has no beliefs about deities is still not a religion.
This is a fact. When I ready your post about giant isopods, I actually formed a couple of beliefs at the same time: 1. giant isopods probably don't exist but I haven't researched them so I am not sure what an isopod is (as an aside: I am specifically not Googling isopod to see what you mean here. And biology is a mystery to me; I never study it, have never studied it. I pretty much dislike all the animal TV as well.); 2. the definition of a small area in the antarctic may be as large as several square miles given that the antarctic is several thousand square miles; 3. as "special type" may mean here several things, so I came to the belief that you don't define examples well if I am honest. And that is just three. The position you don't have in atheism but are describing as a lack (and I have to be specifically vague here so this is going to come across as strange) is if you don't believe in something you have never heard of. The problem is when you hear it you start to create beliefs about the new thing you just heard about. Since you have heard about God and rejected him/her/it, atheism isn't a lack. it just a belief in the negative.
There you go again, you define atheism as a rejection of beliefs if deities, when that is not what Atheism is.
There is no point in talking to you if you refuse to use the actual definition of atheism and instead choose to define it as you so please with no regards for how it actually is defined.