I think the flaw in the argument is in the assumption that Islam is something better (or even different) from other religions. Like most other religions, it is simply a set of beliefs that can be taken up and discarded at will, even if this can take generations. Taken in conjunction with education I would expect such beliefs to be tempered with reason. My guess is that the growth of Islam will reverse as people become educated and so will be self limiting. I can't see many places in the world accepting dictats from a bunch of right wing clerics. I don't even think that this will last long in Iran and may well have changed already except for the political machinations of Ahmajinedad and some unintended "help" from the west. You may argue that this is not what Islam is about, and you may be right, but it is how many see it from both insde and outside Islam. One of Islam's strengths, as seen by yourself, I think, is that it allows for people to decide for themselves in its interpretation - it is between you and your God. But this is not how many others see it; many would prefer it to impose strict rules, not only upon themselves, but also on others. I expect there are many other shades also and in this it is little different from Christianity. In Christianity the power of the Pope to dictate to large numbers of people has diminished over the years, and rightly so. Time has long passed when most people, even catholics, actually believe the Pope to be God's representative on earth and for him to be right on every issue. At present Islam is enjoying a position where it can be all things to all men and many of its members are happy not to look too hard at the differences. The religion does not seem able to stop the Sunni and Shia factions killing each other even though, to western eyes the differences are subtle. It does not stop many liberal muslims being imprisoned in Iran for disagreeing with the Mullahs or for a person in Afghanistan being threatened with execution for simply changing his religion from being a Muslim. There are a large number of people who agree with such positions within Islam and those who would wish the imposition of Sharia law in the world. These people are not going to accept any watering down of their view of Islam because it offends the sensibilities of moderates. In their view the infidels can be destroyed. I know this is an exteme view of Islam but it is present and prominent. I think the seeds of destruction are already visible.