Artamo Wrote: You don't have to worship a god in order for it to be considered a religion. Satanism founded by Anton LaVey doesn't approve of any higher beings but it's still considered a religion.
But yeah, I agree. Atheism isn't a religion.
For it to be religion, it's formed off a system of faith and worship. Religion implies (according to the Merriam-Webster dictionary) that there are practices, beliefs and worship in place. LaVeyan satanism is a bit tricky for me to comment on considering I know nothing about it but they use the figure of Satan even if they don't literally believe he exists.