Atheists say that Atheism isn't a religion because it doesn't have a God/Goddess or gods/goddesses to worship. You don't need them to worship something, you just need something or someone(persons) to worship.
It's pretty obvious that Atheists worship Charles Darwin because of his paving the way of 'proving' evolution. Atheists also worship other famous theorists and scientists that try to disprove God's existence and/or prove evolution.
So yes, Atheism is a religion.
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Atheism by definition is the lack of worship. You can be an atheist and an opponent of the theory of evolution. You could say that aliens plopped us here five minutes ago with planted memories. Even if people who do subscribe to the theory of evolution are atheists, is worship the right word? No, you're tripping.