A religion is not just a belief. It's a set of beliefs, plus rituals, plus culture...
It can be argued that atheists believe that there is no god (it depends on how you define "atheism", and there will always be people who talk about "strong" and "weak" atheism, etc.). But even if it is a belief with no possible proof, it does not lead to any common behaviour, rituals, or whatever. It takes more than a belief to make a religion.
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