I think that if there go on being great wars and great oppressions and many people leading very unhappy lives, probably religion will go on, because I’ve observed that the belief in the goodness of God is inversely proportional to the evidence. When there’s no evidence for it at all, people believe it, and, when things are going well and you might believe it, they don’t.

Bertrand Russell (1872-1970) English mathematician and philosopher

Interview by Woodrow Wyatt, BBC TV (1959)
    (Source)

Collected in Bertrand Russell's BBC Interviews (1959) [UK] and Bertrand Russell Speaks His Mind (1960) [US]. Reprinted (abridged) in The Humanist (1982-11/12), and in Russell Society News, #37 (1983-02).