"The fish doesn't see the water." When you are Christian, or grew up Christian and have never stopped self-identifying as such (even if you've stopped going to church), things like... oh, having your religion's special days be nationwide legal holidays, or having to say a daily prayer before you start school, or having the symbols of your faith prominently displayed in public buildings, or seeing a leader of your faith always be the person to open a session of Congress, doesn't seem unusual or strange; it's just the normal order of things. Even if you know people of other faiths, it's hard to understand why they're getting so upset over something you see as trivial; hard to internalize the fact that it's not trivial to them. (The people who were so outraged about having a Muslim cleric open a session of Congress, if they had any empathy, might have realized that they'd just gotten a taste of what Muslim Americans (and pagans, and atheists, and Buddhists, and Sikhs, and Native Americans who follow the old ways) get all the time. But I suspect that most of them don't have that much ability to put themselves into someone else's shoes.)