Robert Campin has written a consise prescription for World Peace and it shows his concern for humanity in general. However, there is a tendency towards Dogma and assertation of belief that is the same as prescribed by 'Religion'. We must keep in mind what is the underlying problem that causes strife and dissent. In my belief it is the Animal or Mammalian 'Self' Commanding to 'Evil" (Herein taken to mean satisfaction of human wants and desires that are over and beyond immediate survival requirements and lie in the negative spectrum).
We need to beware of the state wherein this Lower Self assumes the garb of Faith. I believe that most of our troubles start when this state arises. Whether it arises in Islam, Christianity, Atheism, Transcendentalism or whatever.