You are very much mistaken.
Hundreds of thousands if not millions have been killed and are being for their sects in several Muslim countries as we speak.
Most Muslim majority countries have zero or minuscule minorities left. This is across the board. Think of the reasons for this.
The results of your "best model of governance" are there for everyone to see. Only the blind can't see the obvious facts.
Many of you, almost everyone who can, is running to "secular and democratic" "dar ul harb" countries to escape from this system.
Show me one country at present where this "best model of governance" is being practiced and is successful. Just one.