Was there a historical Mohammed?
During Mohammed's lifetime, there was only one non-Arab reference to him in historical documents.
He was referred to as an Arab king.
The Koran, dictated by the Archangel Gabriel, was not written down until 300 years
after the 'death' of the supposed Mohammed.
The Reverend Falwell's condemnation would be somewhat akin to Osama Bin Laden accusing Merlin of being a pedophile.