Atheists don’t claim that there are no gods. It’s is impossible to prove the non-existence of something, so if you make such a claim, you get into belief territory. Most atheists are agnostic atheists, i.e. I’ll be happy to believe in your gods once you present evidence for their existence.
atheist is probably fine.
if you wanna be anal about it:
atheist - there is no god
agnostic - i don’t know if there is a god and i don’t care
Fwiw, the “a-” prefix (see also “an-”, eg, “anhydrous”) can be described as “without”, “lack of”, or “not”.
Work out the definition for “theist” and go from there.
Atheists don’t claim that there are no gods. It’s is impossible to prove the non-existence of something, so if you make such a claim, you get into belief territory. Most atheists are agnostic atheists, i.e. I’ll be happy to believe in your gods once you present evidence for their existence.