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.