> 1) Atheists do exist.
Are you so certain about that? Atheists, in all cases, are paradoxical. They fall into two categories.
1) I am an atheist because I don't believe in God.
2) I am a atheist because I know God does not exist.
The first sense is not ontological, but based on what they believe. They are, in fact, the reciprical of an agnostic.
In the second sense, they claim the unknowable.
So if atheists exist, they are either mistaken about what they are or they claim knowledge they can not possibly have.
Atheism is somewhat impossible, and atheists, all of them, at best, are agnostics. So perhaps atheists do not actually and legitimately exist.