I've never seen "atheists" claim the strawman in the OP in an open structure, Theological discussion, in unison.
Atheists don't have a structured belief set. There may be sects of them that have created one, but thats just their little club.The OP is a strawman.
Atheism simpliciter, for example, is a positive belief in no God ~ only taken over the "actual" definition as a social colloquialism.
Atheism's literal meaning is lack of belief.
So here we see two usages for the same word, even....... a positive claim (deities do not exist) and a non-claim (lack of belief) regarding deities.....let alone do they have a structured set of beliefs, in unison, about perfection or anything else.
OP = Formal Strawman Fallacy.