Top Ten Things Standing in the Way of World Peace

Religion can cause war if certain religious groups are discriminated or if a religious group kills people for not thinking like them.

Basically WWII, ISIS, Taliban, Al Qaeda (or however you spell it I don't care), Palestine and Israel, etc.
Now I don't care if God exists or not but stop this religious!

Religion can be force for peace too.

Should be at number one

But that doesn't make sense...