Perhaps some relevant articles.
http://www.time.com/time/magazine/article/0,9171,1555132,00.html
The New Unbelievers
http://www.usnews.com/usnews/news/articles/061105/13atheism.htm
I think the matter is more the clash of thoughts, beliefs and ideas. Take religion out of the picture, and one will still have conflicts among humans, and just as often, groups of humans, who share similar thoughts, beliefs and ideas.
Then the matter becomes - how to develop rational behavior that is peaceful and productive (i.e. positive) rather than negative (i.e. with attritubes such as aggression, hostility, greed, vanity, . . . ).
As for morality and ethical behavior, that ultimately comes down to one's choice (internal influence or direction - guided by one conscience), even when there is an external influence.
Then there is the matter of the individual vs the community (e.g. clan, tribe, nation, religion, race, . . . . ) How does one choose between conscience vs deferrence to the group thought or belief?