Hart in his book of the 100 most influntial persons in history Chose Muhammad (PBUH)on the top of this list. He wrote about this choice:
My choice of Muhammad to lead the list of the world's most influential persons may surprise some readers and may be questioned by others, but he was the only man in history who was supremely successful on both the religious and secular levels...
Muhammad founded and promulgated one of the world's great religions, and became an immensely effective political leader. Today, thirteen centuries after his death, his influence is still powerful and pervasive... Like all religions, Islam exerts an enormous influence upon the lives of its followers. It is for this reason that the founders of the world's great religions all figure prominently in this book. Since there are roughly twice as many Christians as Moslems in the world, it may initially seem strange that Muhammad has been ranked higher than Jesus. There are two principal reasons for that decision. First, Muhammad played a far more important role in the development of Islam than Jesus did in the development of Christianity. Although Jesus was responsible for the main ethical and moral precepts of Christianity (insofar as these differed from Judaism), St. Paul was the main developer of Christian theology, its principal proselytizer, and the author of a large portion of the New Testament.
Muhammad, however, was responsible for both the theology of Islam and its main ethical and moral principles. In addition, he played the key role in proselytizing the new faith, and in establishing the religious practices of Islam. Moreover, he is the author of the Moslem holy scriptures, the Koran, a collection of certain of Muhammad's insights that he believed had been directly revealed to him by Allah. Most of these utterances were copied more or less faithfully during Muhammad's lifetime and were collected together in authoritative form not long after his death. The Koran therefore, closely represents Muhammad's ideas and teachings and to a considerable extent his exact words. No such detailed compilation of the teachings of Christ has survived. Since the Koran is at least as important to Moslems as the Bible is to Christians, the influence of Muhammed through the medium of the Koran has been enormous It is probable that the relative influence of Muhammad on Islam has been larger than the combined influence of Jesus Christ and St. Paul on Christianity. On the purely religious level, then, it seems likely that Muhammad has been as influential in human history as Jesus.
Furthermore, Muhammad (unlike Jesus) was a secular as well as a religious leader. In fact, as the driving force behind the Arab conquests, he may well rank as the most influential political leader of all time... the Arab conquests of the seventh century have continued to play an important role in human history, down to the present day. It is this unparalleled combination of secular and religious influence which I feel entitles Muhammad to be considered the most influential single figure in human history.
Most Muslims would agree with Hart except for the theology we blieve it is from God. Please read in my bolgs about Islam. For more discussion of the book see www.adherents.com