There is no central Islamic authority.
This is the biggest problem, as I see it (and Hirsi Ali agrees it's the ideology that needs to be challenged) because then who is to say whose interpretation is correct?
Islam has so many different interpretations and each interpretation is pointing the finger at all the other interpretations saying "They are not the true Muslims, only we are!" and killing each other off.
With no central authority to say what the correct/incorrect interpretations are, aren't they ALL real Muslims, then? And if Muslims can't even figure out what the correct interpretations are, how are non-Muslims supposed to? I wonder if there WAS a central authority, if it would eliminate alot of the killing and harshness? That is prolly a looooooog way off from happening, though.
Anyways, not to detract from the March. Still nice to see.