I thought it was open-minded not to mind what people say when it is perfectly obvious that they mean no offence. I thought it was open-minded to let such things pass. When someone clearly does mean to be offensive it is a different matter.
Threads occur on GN quite frequently in which people 'vent' about new idiomatic expressions that annoy them. I know annoyance is not the same as feeling hurt but that situation (e.g. minding when someone says "I'm good" where one would prefer them to say "I'm fine") has a similarity, at least in my mind. It seems to me to be a case of getting worked up to a greater or lesser extent over something that isn't really important. (No, I am not saying religion isn't important to the people to whom it is important).
Buchan saying the words he said in the situation described was not an attack on anyone's faith or anyone's deep feelings about god. It was simply an awed outburst with reference only to him. He was expressing his emotion, his feeling of awe, not trashing someone else's strong feelings about something entirely different.
If someone feels that their religion or god is "trashed" by what Buchan said (I'd hazard a bet he wasn't thinking of religion or god, though he might have been for all I know), then really I feel truly sorry for them, not in a patronising way, just a baffled way that something they hold so dear is so apparently fragile and vulnerable.
I do not live in a world where human sensitivities have been trashed. Quite the reverse. I live in a world that I believe is becoming more tolerant and more sensitive to the important things in life. It saddens me to think that some people are not experiencing that and feel so negative about the world.