Between immigration and reproduction, Jews are catching up in population growth. Arabs remain narrowly ahead due to increased life expectancy. Lebanon does bear looking at. The Muslims became the majority after the PLO relocated there from Jordan, when the Hashemites kicked them out for attempting a coup. Christians have been leaving ever since, because they are being driven out. Same thing is happening in Bethlehem in Israel.
It’s interesting. Just like the Brits don’t seem to have much trouble with their Hindu Indian population, but lots of trouble with Pakistani/Bangladesh folks, even though all three share pretty much the same culture, except for one Big Thing, so too Christian Arabs cause few problems in the world, but most other Arabs do. So maybe ‘Arabness’ isn’t the problem.