An atheistic worldview is a view of the world informed by an attitude toward that one specific thing. There very much is such. Denying it is unproductive, off-topic, and silly. If you want to deny it, begin your own thread.
No offense, but I encounter more inflexible atheists and more flexible theists every fricken day on these forums.
I figure the theists are the ones who stay for curiosity rather than stubbornness.
Perhaps they seem inflexible because of you're pigeon-holed definition that presumes that atheism entails an entire world view.
If you characterize atheism and frame it in your mind as inflexible, you will be assigning those values to them anytime you hear the label even if they are not really there.
With that said, you are being pretty dishonest if you claim that it's "off topic" to point out that it literally only applies to one thing. No world view is based around atheism, rather atheism is a result of skepticism which bases itself around the value of verifiable and reproducible evidence.
People can cry about that all day, but life has been better since that attitude has permeated the sciences. For some, they take it further and discount even a deistic god (which itself is somewhat unnecessary from a philosophical standpoint and just pushes back many questions a step without really answering anything).
Edit:
As an example, I don't believe in unicorns. That doesn't mean that my Aunicornism defines my entire worldview. Rather my Auincornism is a result of skepticism. There just isn't any compelling evidence that unicorns actually existed or do currently exist. It's as simple as that.
Skepticism, in short, is not believing in something without a reasonable amount of verifiable evidence. The evidence is proportional: small claims require small evidence; extraordinary claims require extraordinary evidence.