Everyone probably has their own beliefs on the role that religion plays in society, and I guess the part it plays in global peace is directly relevant to that.
Whilst it's true that many of the world's worst atrocities have been religiously motivated, it's also true that a lot of our moral, ethical and philosophical background has its root in one form of religion or another.
In terms of modern society, the three "Abrahamic religions" are the foundations for many of our laws.
It's difficult to address the subject of religion without offending someone or other, but I'm personally of the opinion that religion once served a vital purpose in providing order and social structure to the world for centuries, and therefor peace too.
As brutal as institutions like the Catholic Church may have been throughout history, they also served to maintain order and a moral hierarchy upon which entire countries were run.
Nowadays, we have stable governments and intergovernmental organisations that are (just about) capable of filling that role.
In my view, religion should now serve more as a source of moral and spiritual guidance and support for people that seek it. I don't think religion should have anything to do with politics, society or foreign policy.
I also don't think it should be enforced on people that don't believe it, or used to segregate or divide people.
Unfortunately, the people running the world's governments these days don't seem to agree.
I feel that they see religion's power to unite and divide people as a tool to manipulate and engineer favorable political situations, and a lot of the world's current peace problems stem from this.