Of the three Great Abramiic religions, only Islam has not had a reformation.
The Koran is viewed by too many as the literal word of God, not metaphors & allegories.
As we all know the Koran has some despicble suras. It is true that moderate Muslims do not bu in, but they may not be very religious.
It seems to me that the issue is , how to moderate the more pious, extreme group.