In response to the opening question:
NOLet me start by going through a few examples of conflicts often blamed on religion:
The Middle East:In order to gain allies during WWII England promised the same piece of land (Israel) to two separate groups who did not have a friendly history with each other. At the end of the war they were told to share the city. It hardly seems surprising that they ended up fighting. It's also worth noting that Israel ranks 19th in the
least religious countries of the world. Link:
http://www.gadling.com/2007/08/23/least-religious-countries/The Crusades:Examine some of the architecture in southern Spain, especially in the older buildings. You'll note there is a distinctly Moorish influence. That's because the Seljuk Turks had invaded Europe in an attempt to expand their empire.
Turkish forces had recently conquered Jerusalem from the Byzantine Empire, Europe united under the Pope and retaliated. The two factions spent a great many years fighting back and forth over who would control which territories. Later Popes repeated the use of the term Crusade over wars of other causes.
I'm not going to go into detail about each of the crusades. The wikipedia article is pretty good, here's the link:
http://en.wikipedia.org/wiki/CrusadesThe IRA:Often blamed on conflict between Irish Catholics and English Protestants. Consider this though: England conquered another country and then took it over. Ireland then tried to rebel, and was defeated. The remnants of Ireland's army continued guerrilla fighting, eventually forming the terrorist group.
Jihads:During fighting in the middle east the US supported Israel and several other countries. The US made enemies in doing so. Those enemies then attacked us as best they could.
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Please be clear that I'm not trying to place blame or point fingers for any of the above conflicts, merely pointing out that none of them were cut-and-dry "we are religious therefore we fight you!". I have
never found a record of any major conflict wherein I honestly think religious differences were the main cause behind the battle.
If the world is ending, you can't blame it on religion, unless God is destroying the world, Rapture style.
Notably, the Cold War, which is definitely the closest humanity has ever come to wiping itself out, was between the US (a country that claims neutrality on religious grounds, though that's debatable) and the USSR, which was one of the few officially atheistic states ever to exist. They even enforced atheism by law.
Incidentally wasn't the USSR also known for repressing people and a heavy emphasis on big brother/secret police type policies?
Just saying, there aren't to many examples of purely atheistic states out there, and some of the ones that are out there aren't exactly shining stars of freedom, peace and happiness.
Religious beliefs
are frequently corrupted/manipulated for propaganda purposes, but blaming wars on religion is like blaming the USA's foreign policy on eagles.
"Doing away with" religion has been tried before. It's usually called genocide. It hasn't turned out well in the past.