The greatest tragedy in mankind’s entire history may be the hijacking of morality by religion.

Arthur C. Clarke (1917-2008) British writer

Essay (1990), “Credo,” Living Philosophies [ed. Clifford Fadiman] (1990 ed.)
    (Source)

Later collected in Greetings Carbon-Based Bipeds!: Collected Essays 1934-1998, Part 5, No. 10 (1999).