Even then we do not have proof they are a divine godly being - they are being of immense power yes, but they have flaws and life cycles.
But it is lesser beings that have inferred the title of god upon them.
At that point, what's the difference? Because at this point it seems like the definition you're using for godhood isn't one that suits the nature of the setting. :v
The nature of the setting isn't exactly relevant to how one might define true godhood.
For me to be a true god one needs to be an all powerful, infallible, omnipotent entity that exists in-spite of everything else in whatever given universe/reality.
Nothing in the Runescape universe meets this criteria. Elder Gods may be a pinnacle of known power, but they are still flawed and have needs and desires and limitations.
Pinning Elder Gods with a yup real genuine "god" badge to me is like calling the most powerful world leaders "gods" irl - just because they are the pinnacle of power that we are aware of us doesn't automatically make them a deity.
Atheism is never impossible because it is the disbelief in any form of deity. Just because a particular faith groups calls a particular powerful entity their god and it can be shown that entity exists does not mean you have to believe it is a deity and have a religious faith in it - you can chose to simply believe it is a powerful being that exists by pure chance the same way you do and in doing so you are atheist.
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