It is like the parable of the turtle and the frog crossing the river except the Muslims don't seem to die in equal numbers because too many Christians are blinded to the truth.
I’m not familiar with the “parable of the turtle and the frog”. Sounds similar to Aesop’s Fable of the Scorpion and the Frog. Is It?
http://shortstoriesshort.com/story/the-scorpion-and-the-frog/