Islam is the final semitic religion, like Judaism and Christianity before it they start with Abraham, that is their common thread. To make a convoluted story simple Muslims believe that Islam (meaning "submission") is the final evolution of Christianity and Judaism brought forth my Muhammad the final prophet.
I
believe the reason why the terrorists believe that they can convert Christians and Jews is because they are "halfway there" so to speak, and since Buddhists don't believe in God in the same sense as Jews, Christians and Muslims do there isn't any hope for them in their eyes. In a way Buddhist monks really don't believe in Buddha as a deity but as a philosopher, however the more common religion believes Buddha to be a god. My memory is fuzzy on this but I think the names are Theravada and Mahayana; Theravada being the monks version and the other for the more common man.....here's hoping I didn't switch them it was a few years back.

It'd really help if I had my old textbook with me, but its half a world away.