All religion teaches about peace. Islam only religion that not only teach about peace but It demonstrate how to acheive the peace. When you talk about Islam don't talk about some black sheep in the society. these people does not represent the Islam. Islam not allow to anyone kill , harm , backbite or say anuthing wrong about any person. If anyone kill innocent Shariah law will give death penalty. The Oppressed one only pardon not courts or lawyers. By implement the rule of ALLAH we can achieve piece.