You are getting caught up in semantics, remember Islam and Christianity both stemmed from Judaism...Go back far enough and you have Abraham (and Zoraster before him), he had two kids (I think I have the names right so far) he Jews believe that they are all decedents of the second kid while the Muslims think that they are descendents of the first born son...... So they both claim that the same area of land is rightfully theirs.

Not only is their a common basis for the religions, their is a common ancestor if you believe the Old Testament. So this is just a family dispute between cousins over an inheritance....See this is why every one should have a will.