Why do atheists deny that they are just biorobots?

[Esquilax]

Here's what confuses me. I have exactly the same epidemiological stance, apply reason to experience, and yet I reach a different conclusion, i.e. God exists. Why then, is my belief in God a worldview and your opposite conclusion not one?

Don't you have a book of attendant other beliefs that go along with your god conclusion that you're bound to follow? A B-something?

That's why. In your case, there really is a whole bunch of things your chosen religion entails, which atheism just does not have. Now, I don't think that's universal, since there are god conclusions that don't make any additional demands upon the person who accepts them, like deism, but in terms of organized religions there's certainly a lot of additional premises included that you're morally bound to follow, in accordance with the doctrine.