Atheism is the lack of belief
Atheism is the lack of belief in the existence of gods. It is not a belief system or a religion but the denial that supernatural beings exist. There are atheists with all sorts of philosophies and beliefs.
You’re already an atheist
Even if you believe in a god, you probably don’t believe in other gods – Zeus, Osiris, Jupiter, Thor, Allah or Jesus. It’s hypocritical to be skeptical in the holy book, revealed prophets, miracle stories, or holy men of all religions but yours. You are an atheist when it comes to everyone else’s gods, so why give your god a free pass?
The burden of proof is on the theist
Can you prove that an invisible pink elephant is not floating above your head? How does one prove a negative in the absence of evidence? Theists make the exceptional claim that there is a god. That claim requires exceptional proof. The burden of proof is on the theist to prove God exists.
By using reason and science, humans have been expanding our knowledge of the world. Yet religionists continue to claim that there exists a supernatural realm immune to reason. Where is their proof? If a god is needed to create the universe, what created God? Rather than offer proof, mystics have often tried to silence and discredit those who reveal the complexity and majesty of the universe.
There are natural explanations for the universe
What keeps flowers from turning into rocks, or rocks from floating in the sky? It’s not the will of a supernatural deity, but the fact that flowers are not rocks, and gravity keeps things on the ground. The universe operates according to causal principles, without the need for any supernatural power to keep things from getting chaotic.
Morality does not need religion
Religious texts can offer moral guidance, but they are not the source of moral principles. Humans discovered long ago that following certain rules makes life more productive, peaceful, and pleasurable. Morality derives from human nature, not divine guidance. If one wishes to live a virtuous life, it is better to do so because of the earthly rewards of being virtuous than the fear of eternal punishment. Unlike a theist, an atheist knows that one life is all he has, and will try to live each day to the fullest.