I could go into all kinds of (obvious) reasons why this is so, but my first response is this (and you’ve probably heard something like it before):
I am an atheist because I do not believe in any deities. None. Zilch. Zip. Baal? Nope. Helios? No. Lotan? No. Yahweh? No.
Christians, Jews, and Muslims (for example) are also atheists. Do they believe in Baal? Nope. Helios? No. Lotan? No. Yahweh? Well, yes; that’s the only difference.
If my atheism is a religion, then so is the atheism of every single believing person on this planet. And if all of atheism is a religion, then Christians, Jews, and Muslims may have a problem since they’re not supposed to worship anything but Yahweh, Yeshua, and the Spirit. According to their own teachings, they should not have two religions.
Don’t worry, believers; atheism is not a religion. It simply means you don’t believe in a god. Welcome to the atheist club … because you are one.
I contend we are both atheists, I just believe in one fewer god than you do. When you understand why you dismiss all the other possible gods, you will understand why I dismiss yours.
–Stephen F. Roberts