When you say Christians were “participants” in World War II, I’m assuming you are counging the millions of Christians who died under Nazi persecution, correct? To say or even imply that Nazis are Christian is grossly innacurate since Pius XII himself condemned Nazism and its racist policies as clearly being against the tenets of the faith. This was basically a no-brianer. If the Nazis commited geocide in the name of the one true church, then you’d have a case.
Those Muslims who commit terror are indeed doing so in the name of Islam. They can pick up the Qur’an and point to the exact passage where Allah calls them to do so. There are entire Surahs (chapters) devoted to how Muslims are called to wage war and triumph over unbelievers, and exactly what they can and can’t do with them afterwards.
As for simply blaming Arabs and/or Pakistanis is both dangerous and racist. Because of recent events in the US, it’s a common PR tactic under the current administration to say, “Oh, it’s just a few bad apples within Islam responsible for everything.” Wrong. How many terrorist acts have been commited against Christians in Indonesia? Remember the bombings of the churches/Cathecral in Jakarta as recently as last year? Did you know Muslims are waging a war of genocide against the small population of the Mulukkas (Spice Islands)? Did you know the Indonesian terrorist group Jemaah Islamiya, responsible for the terorist bombing in Bali 2 years ago which killed over 200 people, is also exporting their terror campaigns via other Muslim groups, specifically in the Philipines?
I’m using the Indonesia example to combat your assumption about this wayward group of Arabs and Pakistanis. I could continue and name many more Muslim terrorist groups spanning Muslims throughout Africa, Bosnia, Chechnya, Kossova, Afghanistan, Iran, Kashmir, Bengladesh etc. None of which are either Arab nor Pakistani.
So, ask yourself this: why are there so many Islamic terrorist organizations throughout the world? Why do so many people commit these acts in the name of Islam?
Europe was the bastion of Christian culture. It destroyed itself. What the pope said isn’t important. It’s simple. Christian societies and cultures killed millions. They killed Christians, and they killed Jews. And the attitudes that led to the Holocaust grew and thrived in a Christian continent. Note the apology by the current pope.
Christians will say that people from their culture who commit atrocities are not really Christians and do not represent Christianity. Then they will say that the acts of any Muslim represent all Muslims.
This does not mean that Christian cultures are any worse than other cultures. It just means they are no better.