@humbled:
I think it is far more serious than that. For example, if we consider Christianity - there are countless versions of Christianity, and each sect has its disagreements on just about everything you can think of - but not everything. Whether you are a Catholic, Baptist, Presbyterian, or even JW, there are some core fundamental beliefs. For example, the doctrine of any of the religions I listed would agree that Jesus Christ died for our sins, and was raised from the dead. This is a fundamental Christian statement. All Christians agree with it.
Likewise, for Islam, it is fundamental that Mohammad was the excellent example of conduct. It is fundamental to Islam to be political as well as religious.
I am all for those Muslims seeking to separate mosque and state. However, this isn’t about some theological disagreement (like whether there should be icons or even if the Trinity is real), this is a fundamental change.
Islam doesn’t need the equivalent of a Christian reformation. It needs a new leader. It needs an equivalent of a Jesus to come around and invalidate chunks of the current Quran. But even if that did occur, they would be Muslims any longer, rather some new religion. The world would be better for it, but there would be a bunch of Muslims that reject it, just as the Jews reject Jesus.