Why atheism, specifically? The question being, why atheism instead of agnosticism, perhaps, or plain indifference?

Never really saw the point in separating things out like that, to be honest. Either you believe in religious bullshit or you don't, and everyone who doesn't is in the same boat, really.

And that concludes National Ask an Athiest Day, thank you for playing! Oh wait, it's noon. I better go grab some lunch.