[PhoenixAlive]

It depends. I do not believe that non-spiritual atheism (for example, people who don't believe in God, and don't care to align themselves with any particular religions) is a religion.

However people who do not believe in a deity can still be religious. Satanism and Buddhism have been mentioned. Etc.

For the most part, I've noticed that non-spiritual atheists look down on religion and would feel insulted if someone told them they were part of a religion. I don't know why anyone would insist that they are. If they don't want to have religion, then who am I to say that they have to?

For atheists who believe that science is their "religion", I'm sorry but I find that ridiculous. Scientists who believe in the same theories consider themselves to belong to a school of thought. However, belonging to a school of thought is not the same as having religion. Religion is not only faith in something that cannot be proven (and science can be proven). Organized religion also offers a set of rules to live by, and usually has a social aspect like mass, or service, or gatherings, etc. To believe in science is not faith, its logic really. I don't see how that can be considered faith.