True. I do. Though I don't express them online. If I said I believe or experience X online, I'd expect someone may ask me what that X is whether a serious inquiry or not. I think it's both, though. I used to know a good friend who couldn't think about anything that countered her belief system. Cognitive dissonance is an evolutionary thing, really. It leads the body/mind to feel threatened (a perceived danger) when the mind is conditioned to think one way for survival and not challenged to think any other way for fear of being hurt (emotionally, physically, so have you).
It's healthy to set borders but when you express your beliefs online (people in general) it becomes more of making yourself vulnerable-not the fault (lack of better words) of the questioner but the one being questioned. I think it's healthy to express one's belief and have enough strength to be challenged but then know if that is too much on the mind, its safe to not express the belief at all-even if it's just "I believe god exists" can cause such feelings.
True, not all have cognitive dissonance, but then what's the harm of talking about one's experiences to strangers as opposed to say people that person knows (in my opinion, strangers would be less threat than people we know given strangers only know what they are told-people we know know about us despite what we tell them). If you get me?