I would like to make a warning: Anything that is against any one religion is forbidden in this thread. Being against religion as whole is fine though, IMO.
Religion is just but one of many reasons the human race have fought in war. If religion were abolished, there would be dozens of other reasons to rally war over - land, territory, riches, natural resources (oil), nationalism , pride, etc. Neither WWI nor WWII were fought over religion. Even the biggest holy war of them all, the Great Crusades, despite being blessed by the Pope and the Catholic church as a religious war really came down to restoring access to holy sites in Jerusalem - seems like a land issue to me.
Shure religion played a part but for most of the time its for "Crown and country." The need of wealth and land by one country.
Every "religious" war is always rooted in other issues, religion is just used as a way to justify the means. (Same goes for captialism vs. communism and any other idealogical based conflicts)
I would like to make a warning: Anything that is against any one religion is forbidden in this thread. Being against religion as whole is fine though, IMO.