Christians (generically, they could or could not be Christian) are also going from the Palestinian territories, especially since Hamas took control.
In 1900 40% of the Palestinian population was Christian. That's way before Hamas---but they were still treated like dhimmis. The whole Maronite population in Lebanon would have been wiped out if the French didn't get involved in the 1860s or so. Christians have been boogeying out of Muslim esp. Arab countries, as fast as their backsides can carry them. Jesus is basically considered a nasty critter in Islamic lands even for all his staus as a prophet before Muhammad.