By pointing out this fact I am neither opposing working with religious groups that favor peace nor asserting that Martin Luther King Jr. was a warmonger.
But religious peace activists could, as far as anyone can tell, be peace activists without the religion.
This advertisement could NOT promote war without religion. Its entire basis for promoting war is religion, for which no substitute is imaginable.
Exactly like an argument for abolition of war, the ad begins by asking why we should engage in so much killing and destruction at such great expense, while other crises cry out for our attention.
Why? Because magic.
An ancient book says there must be war. And that settles it.
Clearly one can attribute magical powers to that book and choose to ignore selected parts that our culture has outgrown.
Why not the part about war?
Because we have a culture of war, and religious support for it is only one part. But it's a part we can set aside if we choose to, in a process of learning to think more critically. And that could have far-reaching results.
Imagine all the people living life in peace.