WWIII won't be fought over oil but it will be fought and unless you keel over with a heart attack, within your life time.
It will contain nuclear weapons - most probably started by the detonation of one. It will not however, throw us back into a "doomsday". The only 2 countries that could have potentially done that are the U.S. and Russia - and neither are stupid enough to use them on one another.
Israel - 7 million Jews surrounded by 100 million muslims. That's where it'll start.
http://www.globalbydesign.com/resour...ation_map.html
That (though it doesn't really look like it - is a population map