“Religion thus makes easy and felicitous what in any case is necessary; and if it be the only agency that can accomplish this result, its vital importance as a human faculty stands vindicated beyond dispute.”

“The Religion of Life” (1858)

Source: World War Z: An Oral History of the Zombie War

Source: The Limits of State Action (1792), Ch. 1

Interview (<!-- most likely 17th April -->April 1935), as quoted in The Genuine Islam, Vol. 1 (January 1936). A portion of the statement also appears quoted in The Islamic Review, Vol. 24 (1936) http://books.google.com/books?ei=0_neSrrfD4K0NIPBiaAF&client=safari&id=4MnRAAAAMAAJ&dq=%22try+to+whittle+down+their%22&q=Shaw#search_anchor edited by Khwaja Kamal-ud-Din, p. 263
Disputed
Context: I have always held the religion of Muhammad in high estimation because of its wonderful vitality. It is the only religion which appears to me to possess that assimilating capability to the changing phase of existence which can make itself appeal to every age. The world must doubtless attach high value to the predictions of great men like me. I have prophesied about the faith of Muhammad that it would be acceptable to the Europe of tomorrow as it is beginning to be acceptable to the Europe of today. The medieval ecclesiastics, either through ignorance or bigotry, painted Muhammadanism in the darkest colours. They were in fact trained both to hate the man Muhammad and his religion. To them Muhammad was Anti-Christ. I have studied him — the wonderful man, and in my opinion far from being an Anti-Christ he must be called the Saviour of Humanity. I believe that if a man like him were to assume the dictatorship of the modern world he would succeed in solving its problems in a way that would bring it the much-needed peace and happiness. But to proceed, it was in the 19th century that honest thinkers like Carlyle, Goethe and Gibbon perceived intrinsic worth in the religion of Muhammad, and thus there was some change for the better in the European attitude towards Islam. But the Europe of the present century is far advanced. It is beginning to be enamoured of the creed of Muhammad.

On War (1832), Book 2

1940s, Religion and Science: Irreconcilable? (1948)
Context: Does there truly exist an insuperable contradiction between religion and science? Can religion be superseded by science? The answers to these questions have, for centuries, given rise to considerable dispute and, indeed, bitter fighting. Yet, in my own mind there can be no doubt that in both cases a dispassionate consideration can only lead to a negative answer. What complicates the solution, however, is the fact that while most people readily agree on what is meant by "science," they are likely to differ on the meaning of "religion."

p, 125
The History of Freedom in Antiquity (1877)

Source: Islam: the Misunderstood Religion, Chapter 11, Islam and Sexual Repression, p. 207.