Here is one of the things that can happen when people believe that theirs is the only true religion.
http://news.bbc.co.uk/2/hi/south_asia/4823874.stm
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)
