Atheism is a lack of belief in a god or gods, not an active disbelief in any. There are many agnostic atheists who aren’t convinced deities exist due to the lack of evidence, but won’t claim they don’t exist outright because it’s an unfalsifiable claim to make since nobody can prove or disprove the existence of any deity in a falsifiable and verifiable way. To make such a claim would be dishonest.
In a way, saying that atheism is a religion is like saying that not playing baseball is a sport.
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