I think the thing that has annoyed me both here and in RL, is that people who believe feel that I am missing out on something by not believing, or (Olympe?) am a less rounded, more shallow person because I am not prepared to accept it as a possibility without evidence.
Atheists are often(this thread included) accused of being smug, well from an atheist point of view that is exactly how many religious people come across.
I would not say to someone with belief in god(s) that they were missing out on something deeply fulfilling by ignoring my version of reality, yet this is what many religious people feel they have to change in me.
It is difficult as an atheist not to want to stand up and be counted, I think many atheists feel in a minority in a world that seems to revolve around religions of all sorts.
The 'new atheism' that has been referred to here is a result of that I think, along with more people feeling able to admit their true beliefs now that it has become more socially acceptable(and less likely, with the development of knowledge, that an afterlife exists other than in our wishful thinking[or perhaps it is an acknowledgment of our inability to accept ourselves as truly mortal])
As UQD said, the default setting should logically be that of non-belief. If there is a desire to seek the divine in some, then this should be a private matter, and not have such influence in the running of life (politeness aside).
Religion in all it's forms is named in so many World problems. Non belief isn't.