Polls show that the least trusted group in the United States are atheists. Want statistical evidence? I've got that.
First, there's the study from Minnesota:
http://abcnews.go.com/Technology/story?id=1786422&page=1
http://atheism.about.com/od/atheistbigotryprejudice/a/AtheitsHated.htm
And then there are statistics on public attitudes about atheists in general: http://atheism.about.com/od/atheistbigotryprejudice/a/AtheistSurveys.htm
Christians constitute a full 81% of the country (and are, therefore, a very large majority). The largest group of Christians, according to Pew, are the evangelicals, comprising 26.3% of the American religious public (to be compared with the roughly 2% who are atheists, based on most estimates.)
I found this comical little quote from Pat Robertson:
And, despite being a member of the 2% who are atheists and belonging to one of the most hated groups in the United States, I feel bad for all the Christians that we liberals have whisked off to death camps. I mean, we really shouldn't be exterminating the Christians en masse.
Wait....... what the....???