I think Bertrand that your question to pickle about if it is possible for believers to frame the way they talk about faith in such a way as not to 'include' non believers in that worldview is interesting and I am doing some thinking about that. I think what I said on the other thread was difficult for you because I did not see eaten my worldview from anyone else, I included humanity in my conception of God as creator etc, and to you that was offensive because I did not separate out my own belief from speaking it over others. At least that's what it seems to me happened? What I was attempting to do was explain where I was coming from without dragging people without faith into my worldview but it kind of misfired 
But like pickle said, I'm not sure there is a way to frame that language. Pickle used a creationist example, but any would do. I believe that Jesus lived and died and rose for humanity; if I say that I only think that is for some then that would reduce and minimise my belief, but if I say for all then that may appear arrogant. It's really difficult... Just pondering here. How would you prefer we frame things like this?
Agree with pickle on Christian values, too. Our western worldview is pretty close to the heart of the message of Christianity, but many cultures in different ages have taken a very different route.
On your original quesition: I do think atheists and people of faith can have friendly, open discussions, but that's when there is a choice to be respectful, not to belittle the other and to be kind. The godless atheist thing is the kind of thing I might say to my atheist mates but we jibe each other a lot in this way, they call me the religious nutter in the corner, but it's all in good spirit and we love each other. However, if such a comment is made and out of character or not a joke then I'd be surprised and upset too.
I'd like to think that we could achieve what the other thread set out to do here on MN. 