I know it was travis -- I was agreeing with hima nd disagreeing with you -- you can't compare Mecca to the Vatican. And for Muslimes, Mecca is the be-all and end-all of their cult
Muslims adhere to the Five Pillars, and Mecca is indeed their holiest city. But like Catholicism, the religion would not die if Mecca were destroyed. Muslims would simply adjust to the new reality. They aren't going to give up believing in Allah simply because Mecca is destroyed. The Five Pillars would still apply, an short of destroying every reference to Islam in the world you couldn't destroy that.