Muslim hostility to Christians.

In Lebanon, Christians represented 50-60% of the population prior to 1975; today this percentage has declined to 25-30%. Most importantly, their political influence has severely weakened. The Lebanese emigration ministry estimates the number of emigrants at five million, more than three and a half million of which are Lebanese Christians. In the past Lebanon was known to be a safe haven for persecuted individuals who were hunted because of their religious or intellectual beliefs. Today, however, it is driving out its own children because of the Arab infringement, the Palestinian foolishness and the Syrian occupation.

"The Ordeal of Arab Christians." By Magdi Khalil , The American Thinker, 9/18/05 <-- Dhimmi Watch, 9/18/05.

It's much worse than as portrayed here. See The Decline of Eastern Christianity Under Islam. by Bat Ye’or