Okay, religion deserves no special or extra consideration above and beyond that awarded to questions of everyday physical nature.
Then what about other words or rather what they connect to? I won't ask you anything, rather I will try to explain something. When I try to go beyond works like atheist and theists, I find that behind those labels and all other labels are good and bad people. But in fact it has nothing to do in the universal singular sense with good and bad, because these words don't take place disconnected from other aspects of reality. What I am trying to get at is this: I am outside my own culture, because I am crazy, irrational and delusional. As an analogy I am without legs, but still a human. So for those parts where it doesn't matter that I am without legs, I can see my own culture different that those who are in and can function in it as "normal" people.
So I don't think there are any words which deserve special or extra consideration above and beyond any one else, because then I find that I actually overlook something. That includes the words - everyday physical nature, I am sorry to tell you. Natural science is a wonderful, beautiful and useful tool/methodology, but it has its everyday limitations. I.e. you can't live without it, but you don't live solely based on it.
That is what I have found out about words and how they interconnect to the rest of reality. No words are sacred or beyond doubt or questioning and as far as I can tell that is a part of it - some people in practice have functionally sacred words and others don't. In everyday life there is also that.