No, atheism isn't a belief at all. It's the singular response to theism - a-theism, not-theism. It is the position of "I withhold belief in gods until there is sufficient evidence to support belief". Individual atheists may or may not take it further into active belief in no gods, but that's not atheism.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'
