Did Muhammad exist? His response was quick, condensed and to the point. “Well, no. If you mean the prophet of Islam who was purported to receive revelations from Allah that were put into the Koran. No, that guy certainly did not exist,” he boldly proclaimed. “The regular guy — he possibly existed.” Robert Spencer said that the greatest surprise in his research was that it led him to doubt something he had always maintained — that Muhammad was, indeed, real.