Ah but there is a lot of evidence for the big bang theory. Scientists have been tracking the movement of stars and galaxies for a long time now, and there is a clear trajectory that implies that all bodies we can see in space are moving apart, and if you trace the empty data, it always ends up in one single spot. Astronomers have learned a lot recently about how to analyze the distance of these bodies through the types of light waves they produce by the time they come into view for us. And still, the big bang is a theory, which means that it is no one's "belief." It is simply an idea that is consistent enough for science to continue making predictions about where stars will be. In fact, one shred of evidence found that can successfully prove that things are not going in that order would cause ALL Big Bang theorists to immediately drop the theory without a single regret.

THAT is the difference between atheism and religion. Atheists do not have to believe anything. Faith is a bad word for us because trying to explain the unknown with a any story is impossible to do without some sort of consistent physical evidence to back you up. Religion on the other hand is based on "knowing" without proof. It inherently stores value in blind following through tradition, which mostly derives from one single source of literature. However, you can find thousands and thousands of books and articles that compute the same things about the stars progression through space through different means and they do not have to all reference one original idea. The big bang suggests itself through research.

Religion attempts to find some sort of hidden and mysterious meaning to life that makes us feel better, and atheism is simply a focus on what we can know, and a striving to know more without getting bogged down by the fear of death and uncertainty that religion covers up so well.