The Reformation was a necessary reform in Christianity. One of its fruits, ultimately, was democracy in the state. Along the way the English-speaking church and state suffered through the excesses of a Puritan regime. But the improvement in church and in the state ultimately vindicated even that hard passage.
Islam is going through its Reformation now. I think ultimately - within a generation or two - this will mean a revitalized Islam, as at peace with democracy, science, and social pluralism as Christianity is now.
To get there, though, they may have to go through a hard passage of some Salafist regimes.
The Arab Spring is a huge advance over the corrupt tyrannies, derived from socialism, which preceded them.
I am confident that the ultimate result will be a democratic Arabic Islam.
But in the short run - in Egypt, in Syria, in Yemen - the world may see some less corrupt but equally hard regimes of Islamic Puritans.