“The problem is the intermingling [between Muslims and Christians]. Some Muslims have started to be influenced by this tradition. They have started participating in Christmas and New Year’s celebrations, buying all kinds of stuff at Christmas markets – Christmas trees, toys, whatever.”
Note the moral calculus. Buying stuff at Christmas markets: forbidden. Driving a truck into a Christmas market and murdering a large number of Infidels: rewarded by Allah. Am I saying that Sheikh ‘Alaa Al-Musawi approves of jihad massacres at Christmas markets? No, not necessarily. But those Muslims who have killed people at Christmas markets believe they are performing a righteous act, and that those they are killing are hopelessly depraved.
Meanwhile, the moral critique has always been a part of the Islamic critique of Christianity, going back to the time of the Crusades. There are some analysts today who believe that the immorality of today’s pop culture has driven Muslims to jihad. In reality, however, even when Western culture was quite moral, Muslims decried it as immoral. And the jihad continued either way.