Famous personalities' quotes about Islam: Alexis de Tocqueville
Wikiislam 11 February 2014
Alexis de Tocqueville was a French political thinker and historian best known for his Democracy in America (appearing in two volumes: 1835 and 1840) and The Old Regime and the Revolution (1856). In both of these works, he analyzed the rising living standards and social conditions of individuals and their relationship to the market and state in Western societies.
Alexis de Tocqueville:
I studied the Quran a great deal. I came away from that study with the conviction that by and large there have been few religions in the world as deadly to men as that of Muhammad. As far as I can see, it is the principal cause of the decadence so visible today in the Muslim world and, though less absurd than the polytheism of old, its social and political tendencies are in my opinion more to be feared, and I therefore regard it as a form of decadence rather than a form of progress in relation to paganism itself. 
Muhammad professed to derive from Heaven, and he has inserted in the Koran, not only a body of religious doctrines, but political maxims, civil and criminal laws, and theories of science. The gospel, on the contrary, only speaks of the general relations of men to God and to each other - beyond which it inculcates and imposes no point of faith. This alone, besides a thousand other reasons, would suffice to prove that the former of these religions will never long predominate in a cultivated and democratic age, whilst the latter is destined to retain its sway at these as at all other periods. 
Famous personalities' quotes about Islam: Arthur Schopenhauer
Wikiislam 1 February 2014
Arthur Schopenhauer (1788 – 1860) was an influencial German philosopher, known for his pessimism and philosophical clarity.
Temples and churches, pagodas and mosques, in all countries and ages, in their splendor and spaciousness, testify to man's need for metaphysics, a need strong and ineradicable, which follows close on the physical. ... Sometimes it lets inself be satisfied with clumsy fables and fairy-tales. If only they are imprinted early enough, they are for man adequate explanations of his existence and supports for his morality. Consider the Koran, for example; this wretched book was sufficient to start a world-religion, to satisfy the metaphysical need of countless millions for twelve hundred years, to become the basis of their morality and of a remarkable contempt for death, and also to inspire them to bloody wars and the most extensive conquests. In this book we find the saddest and poorest form of theism. Much may be lost in translation, but I have not been able to discover in it one single idea of valuehttp://europenews.dk/en/node/76910