The old crusades were pretty inept.
We would need another 911 to do that. Should it happen we will have to get the rioters and protesters in the streets/public squares and and incinerate them. This could be easily accomplished thru a public burning of the koran or bombing a few Mosques. Ain’t gonna happen. A kumbya get together like the Bush lied folks advocated is the more likely reaction.
But the Christians won. Large numbers of highly motivated men. Two world wars may have something to do with the present situation. Moreover, virtue today is largely a matter of inclusion, recycling and birth control.
Inept?
They stopped the Islamization of Europe.