Enlighten us ragna
Does any religious book itself tells us in specific words to wage a holy war or a crusade. (an example)
Jihad means to strive or struggle against oppression, if muslims go and blow up innocent people are they striving aginst oppression, or are they oppressing people?

Religious infighting is also a classic example how stupid people can be.
The "i am more right then you" has been going on since ages, it is very much going now also and will go on forever. Religion is just an excuse.