Religion has been exploited to justify acts of violence or prejudice for years.

More recently, Kahanism is an ideology (If I recall correctly) that promotes violence against the Arab population and the taking away of Non-Jewish people's right to vote and uses Judaism for their justification.

Identity Christianity is a violent Christain orginization that finds it's justification from the Bible.

And, of course, we have Al-Queda, Hamas, etc. all Islamic terrorists groups finding their justification through the Quran.

I believe Islam is another religion that has been perverted into a casus belli of violence.