Inhospitable Muslim culture.

Overall the Middle Eastern Christian population has dropped from 20 percent in 1900 to less than 2 percent today.

Which amounts to more than a 90% drop in some 107 years.

Christians left these Muslim lands because Muslims made their lives a living hell.

Consider that my working hypothesis.

"Mullahs and Opiates." By Amil Imani, 8/17/07.