Islam rocks, and so does Prophet Muhammad:
Michael H. Hart
"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 level."
Michael H. Hart, THE 100: A RANKING OF THE MOST INFLUENTIAL PERSONS IN HISTORY, New York: Hart Publishing Company, Inc., 1978, p. 33.
In the Encyclopedia Britannica
"Muhammad is the most successful of all Prophets and religious personalities."
Speaking on the character of Muhammad (pbuh), Mahatma Gandhi says in (Young India),
"I wanted to know the best of one who holds today's undisputed sway over the hearts of millions of mankind....I became more than convinced that it was not the sword that won a place for Islam in those days in the scheme of life. It was the rigid simplicity, the utter self-effacement of the Prophet, the scrupulous regard for his pledges, his intense devotion to this friends and followers, his intrepidity, his fearlessness, his absolute trust in God and in his own mission. These and not the sword carried everything before them and surmounted every obstacle. When I closed the 2nd volume (of the Prophet's biography), I was sorry there was not more for me to read of the great life."
Prof. Ramakrishna Rao
"The personality of Muhammad, it is most difficult to get into the whole truth of it. Only a glimpse of it I can catch. What a dramatic succession of picturesque scenes! There is Muhammad, the Prophet. There is Muhammad, the Warrior; Muhammad, the Businessman; Muhammad, the Statesman; Muhammad, the Orator; Muhammad, the Reformer; Muhammad, the Refuge of Orphans; Muhammad, the Protector of Slaves; Muhammad, the Emancipator of Women; Muhammad, the Judge; Muhammad, the Saint. All in all these magnificent roles, in all these departments of human activities, he is alike a hero."
Sarogini Naidu, the famous poetess of India says about Islam: "It was the first religion that preached and practiced democracy; for in the mosque, when the call for prayer is sounded and worshippers are gathered together, the democracy of Islam is embodied five times a day when the peasant and king kneel side by side and proclaim: 'God Alone is Great' I have been struck over and over again by this indivisible unity of Islam that makes man instinctively a brother.
"If greatness of purpose, smallness of means, and astounding results are the three criteria of human genius, who could dare to compare any great man in modern history with Muhammad? The most famous men created arms, laws and empires only. They founded, if anything at all, no more than material powers which often crumbled away before their eyes. This man moved not only armies, legislations, empires, peoples and dynasties, but millions of men in one-third of the then inhabited world; and more than that, he moved the altars, the gods, the religions, the ideas, the beliefs and souls. . . his forbearance in victory, his ambition, which was entirely devoted to one idea and in no manner striving for an empire; his endless prayers, his mystic conversations with God, his death and his triumph after death; all these attest not to an imposture but to a firm conviction which gave him the power to restore a dogma. This dogma was twofold, the unity of God and the immateriality of God; the former telling what God is, the latter telling what God is not; the one overthrowing false gods with the sword, the other starting an idea with words.
"Philosopher, orator, apostle, legislator, warrior, conqueror of ideas, restorer of rational dogmas, of a cult without images; the founder of twenty terrestrial empires and of one spiritual empire, that is Muhammad. As regards all standards by which human greatness may be measured, we may well ask, is there any man greater than he?"
Lamartine, HISTOIRE DE LA TURQUIE, Paris, 1854, Vol. II, pp. 276-277.
W. Montgomery Watt
"His readiness to undergo persecutions for his beliefs, the high moral character of the men who believed in him and looked up to him as leader, and the greatness of his ultimate achievement - all argue his fundamental integrity. To suppose Muhammad an impostor raises more problems than it solves. Moreover, none of the great figures of history is so poorly appreciated in the West as Muhammad."
W. Montgomery Watt, MOHAMMAD AT MECCA, Oxford, 1953, p. 52.
"He was Caesar and Pope in one; but he was Pope without Pope's pretensions, Caesar without the legions of Caesar: without a standing army, without a bodyguard, without a palace, without a fixed revenue; if ever any man had the right to say that he ruled by the right divine, it was Mohammed, for he had all the power without its instruments....
Many people thought that Muhammad was their enemy, but he was more like the saviour for mankind. And people still think he is their enemy, but no, he is more of a saviour than your enemy.