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Basic atheism is not a belief. It is the lack of belief. There is a difference between believing there is no god and not believing there is a god - both are atheistic, though popular usage has ignored the latter.

Dan Barker (1992). “Losing Faith in Faith: From Preacher to Atheist”, Freedom from Religion Fndtn
Basic atheism is not a belief. It is the lack of belief. There is a difference between believing there is no god and not believing there is a god - both are atheistic, though popular usage has ignored the latter.