Quote Originally Posted by Redleg
And again you would be incorrect -

The wars that happened over religion might not be there if there was no religion - but other reasons for warfare would of been there. Man is a competive animal - when interests of different groups converge - there is often a struggle - sometimes just politicial - verbal, sometimes through armed conflict of one type or another.

There has been some interesting studies done by historical researchers that show even where religion was the major reason for the war - other factors contributed to the war.
The best example I can come up with is the Crusade against the Cathars. That was about power and wealth more than anything else, including religion, even though religion was the vehicle through which the parties concerned expressed these ambitions.