Atheism worships a dead god.

[Existentialist]

Atheist = Someone who asserts that there is no god

All atheists don't deny the possibility of any deity's existence.

That's an ambiguous sentence, so I can't answer it. It could mean there are no atheists who deny the possibility of any deity's existence, or it could mean not all atheists deny the possibility of any deity's existence. You need to be explicit about which of these you mean.