The crusade began in 624AD and according to the teachings of islam, it will not stop until this is an islamic planet.  They have wiped out most of the infidels in the ME. 

 It will be 10 years before Iran has a nuke and they will make good on their promise to wipe Israel off the map. It will be around that same time when they have sufficient numbers in the west to get the crusade in full swing.