No there aren’t. the dictionary gives a primary definition, and it is based on common usage, it is nonsensical to assume anyone is using the word differently from that unless they specifically say so.
I’ve never met one, which is odd to say the least, not that I’d care, as how an atheist defines their own position beyond the absence of belief in a deity is irrelevant to the definition of atheism. In fact it is mainly theists I have met who want to indulge in such semantics.
Not really, all humans are born atheists, as they know nothing, and cannot therefore hold theistic belief, anymore than any other belief.
No it isn’t, it is solely saying I lack theistic belief, the assumptions are your here, unless an atheist tells you more.
I don’t understand the question?
As objectively as possible, and without obviously violating any principles of logic or accepting anything that contradicts known scientific fact. Since you asked…A more pertinent question is why theists believe in any deity without being able to demonstrate a shred of objective evidence, and I think we both know what objective evidence looks like, and the idea a theist might better recognise something as evidence for a deity, when an atheist not might as easily be explained by theistic bias, or religious faith of course, as they’re the same thing.
Well now your search is over…luckily, as it appears you have been asking that category of atheists that have I inexplicably never meet, and only ever seem to hear from second hand through theists.