There is no [absolutely-necessary-entity] and everything in reality is universally sufficient.
That doesn't complete the set. It doesn't say what an atheist feels about slavery, homosexuality, abortion etc. Atheism isn't a very informative religion then.
It makes this assumption without attaining absolute-knowledge, and the limited knowledge it possess is plausible if not universally subjective because we can only conceive reality, not perceive it. :rainbow1:
How can you conceive reality without perceiving it. Also Science and atheism doesn't claim absolute knowledge.