How is that different than any one who believes what they know to be universal truth? Why prefix it with religion? Science has just as many idiots who think that because some scientist says it, its universal truth.
You have 'geniuses' like Stephen Hawking who think they understand the big bang when these are the very people who should know they don't 'understand' it nor do they 'know' anything about it. This is the same sort of problem that results in people being chastised for making 'silly' observations like 'the world is round' when popular 'science' says otherwise
Its a bit ironic that the people who get the most uppity about silly stories about a guy that may or may not have lived 2k years ago are the same people who think they know what happened 14 billion years ago that make just as much sense to the casual observer.
Nut jobs exist in both camps, why do you ignore the guys on your side of the fence and berate the guys on the other side.
Whats offensive is that you feel the need to think you're somehow better than someone else because you believe differently than them.