A religious creed differs from a scientific theory in claiming to embody eternal and absolutely certain truth, whereas science is always tentative, expecting that modification in its present theories will sooner or later be found necessary, and aware that its method is one which is logically incapable of arriving at a complete and final demonstration.

Bertrand Russell (1872-1970) English mathematician and philosopher

Religion and Science, ch. 1 “Ground of Conflict” (1935)