Why is religion such a touchy subject?

I myself am a pantheist and people look at me with such disbelief when I say so and follow with a lecture of how not accepting God into my life gets me no where but to the path of Hell, my friends mom told me I was the Antichrist because I was not a christian and told me not to share my "lollipop" beliefs with her daughter. It's the same for all religions and beliefs and I've never quite understood why people get so offened when you have a different god or ritual. Why is it like this?