This doesn't match any dictionary I have.
Atheism: belief there is no god.
Agnosticism: we don't, we can't, know whether a god exists or not.
> They say there might be a god, or maybe not,
This by definition is not atheism, it's agnosticism.
Atheism: belief there is no god.
Agnosticism: we don't, we can't, know whether a god exists or not.
> They say there might be a god, or maybe not,
This by definition is not atheism, it's agnosticism.
https://www.merriam-webster.com/dictionary/atheism
https://en.oxforddictionaries.com/definition/atheism
You also seem to be strafing your dictionary claim and then ignoring anyone who shows that you’re incorrect. That’s a poor way to debate.
Knowledge is a subset of belief. Both are defined by different words: (a)theism is about belief, (a)gnosticism is about knowledge.
The first dictionary hit I get on atheism matches my claim:
"disbelief or lack of belief in the existence of God or gods."