In most of the places where I've lived, I have not felt oppressed as a consequence of being an atheist, although this may be related to the fact that I am not particularly community spirited to begin with. However, I did feel oppressed while I was attending Brandeis University, an officially non-sectarian Jewish school. The pervasive sense that Judaism was the in-group on campus, and that one was expected to identify with other Jews above others regardless of what else you might or might not have in common, was a major affront to my sensibilities, and I started associating with online atheist communities in response.
It may be worth noting that what I found oppressive was not being surrounded by people who had different spiritual beliefs than mine, and took issue with mine, but being surrounded by people who expected allegiance to a social group I had no attachment to. It would have been okay for me to be an atheist, as long as I was a Jewish atheist, but although I am Ashkenazic on my mother's side I neither have nor want any attachment to Jewish culture.
At Reason Rally a couple of months ago, we noticed that a lot of atheists there seemed to be there for mutual support - because their own communities rejected atheists, because they felt outnumbered and threatened by their peers; the rally was a way for them to feel part of an in-group. Reason Rally is definitely an event that selects for people who feel excluded by their communities most of the time. But there may be a different concentration of people who have had this sort of experience on LessWrong, and we wondered what that concentration was.
Hence, this survey: LessWrong Members and their Local Communities.
If I get a decent sample size, I will post the data for all to enjoy.
EDIT: I added two questions about current and previous religious views to the poll. If you took it before 11:30PM EST 5/2, I'd appreciate it very much if you would take the time to retake it. :)