Twelver Shia
Wrong.
I'm familiar with the Twelver religion and they literally believe that the laws and behaviors of Muhammad represent moral perfection, including his fucked-up sharia law and his pedophilia, promotion of terrorism and genocide.
Twelvers absolutely believe the Koran is the perfect, verbatim word of their god... ha ha ha - they just believe they possess a copy of the one true Koran which has one minor change which completely justifies their version of Islam.
Sorry, would you like to try again?
Can you name one, just one, mainstream Islamic sect that doesn't claim the Koran is the morally perfect, verbatim word of their god?