From the Crusades to the rise of the Islamic State of Iraq and the Levant (ISIL, also known as ISIS), religion is often blamed for some of the world's worst conflicts.

While some use their faith to justify acts of violence, is religion really the root of such conflicts?

In this week's Headliner, we speak with Karen Armstrong, author of Fields of Blood: Religion and the History of Violence, who says politics, not religion, is to blame for the violence in today's world.

Editor's Note: This interview was filmed before the attack in Nice, France.

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Source: Al Jazeera