It is amusing that humans, it seems, unable to devise anything really new in such realms as world-view, ethics or religion, they only unknowingly reproduce the old ones with some modifications. For example, Leftist world-view for last 200 years (Marxism, Communism, Trotskyism, Stalinism and all varieties of Socialism) was and still is a combination of the two many-centuries-old heresies: Pelagianism and Manichean. Even the most zealous neocon, Christopher Hitchens, still follows this combination, replacing the original sin (capitalism) of his previous Trotskyist faith by a new enemy - Islam. He wants us to wage a Crusade against it, but not in the name of God, but in the name of secular New Enlightenment. A ridicule proposition: where can he hope to find enough true believers for that? To win an all-out religious war, one needs to be no less religion motivated and fanatical than his opponent. Atheism is not a weapon, but a fatal weakness in such a battle.
Islam, too, is a Manichean delusion, but combined not with Pelagianism, but with Calvinism in its most pessimistic and antihuman form.