I tend to believe polls, studies and surveys when they all report the same information. Polls can be selective, studies can be flawed, and surveys can have too small of a sample group, but no matter the method big or small, the results always show atheism is not seen as an acceptable position. As reported on the daily show recently, Americans distrust atheists more than they do terrorists. Any politician, no matter if he has the brain of Stephen Hawking, the looks of Johnny Depp, and the charisma of Oprah, can not get anywhere near a seat of power unless he also believes in God. How much more evidence do you need than our own president, the leader of our nation and it's policies, declaring atheists non-citizens? This is not just disapproval, but outright prejudice. Throw in the polices of organizations like the boy scouts and you have blatant discrimination. Where is it that you are seeing any sort of rejection of Christians on this level in America?
Also keep in mind there are many more homosexuals and immigrants than atheists, it only makes sense that you are more aware of their plight.