I still think that Ann Coulter's solution is the correct one when dealing with islam: "We should invade their countries, kill their leaders and convert them to Christianity."
I've never quite understood how that happens. Let's say that Tariq takes Spain again. Would the Spanish convert to Islam or would they merely profess to have converted? As I understand it, such is the case in some places like Southeast Asia, where the people are officially Muslim, but they still retain the core and elements of their indigenous beliefs. I"ve read that Malays for example, are known to make prayers to kitchen gods, and then yell "There is no god but Allah" at the end of the prayer. Strange. And yet, apparently these same people sufficiently identify with Islam that they feel the need to "struggle" and to demand autonomy as they have in the Philippines.
Religion is a cancer, but Islam is pancreatic cancer.