Well in my Opinion (and Experience).
Christians get enrage so easily because almost anything we do that might give them an idea that you're against them and their God. In return. They think we are denying what they believe. Their reaction is that. We are bad, satanic and therefore enemy in their eyes.
Well in your case is more of uh I don't know, tolerant maybe. I just remembered in my experience that in my school. They let the Class watch Passion of the Christ. Everybody is crying about it except me. then They saw me. asked if why I wasn't Crying. I said "I don't buy that".
Then bam! Get branded of a Bad Satanic Fellow who don't believe in God. So far they can tell me all they want. ain't gonna stop me from Chillin' out.