It is customary to suppose that, if a belief is widespread, there must be something reasonable about it. I do not think this view can be held by anyone who has studied history. Practically all the beliefs of savages are absurd. In early civilizations there may be as much as one percent for which there is something to be said. In our own day …. But at this point I must be careful. We all know that there are absurd beliefs in Soviet Russia. If we are Protestants, we know that there are absurd beliefs among Catholics. If we are Catholics, we know that there are absurd beliefs among Protestants. If we are Conservatives, we are amazed by the superstitions to be found in the Labour Party. If we are Socialists, we are aghast at the credulity of Conservatives. I do not know, dear reader, what your beliefs may be, but whatever they may be, you must concede that nine-tenths of the beliefs of nine-tenths of mankind are totally irrational. The beliefs in question are, of course, those which you do not hold.

Bertrand Russell (1872-1970) English mathematician and philosopher

“Is There a God?” (1952)
    (Source)

Essay commissioned by Illustrated magazine in 1952, but never published there. First publication in Russell, Last Philosophical Testament, 1943-68 (1997) [ed. Slater/Köllner].