Unforgivable Sin Quotes
The Prophet Muhammad when he was the spiritual and civil leader never called for the death of anyone who insulted him. This is strictly a mania of extremist followers of Islam. However, it should be kept in mind that the Roman Catholic Church in its history murdered people for insulting the Pope or Jesus. It all stems from the Old Testament call for the execution of heretics and blasphemers.
In addition to the immense secular powers that can be used to obtain obedience, in a theocracy, there is the additional weapon of damnation. See {628182} for his use of some of the others.