Theism, in the broadest sense, is the belief that at least one deity exists. In a more specific sense, theism refers to a doctrine concerning the nature of a monotheistic God and his relationship to the universe . Theism, in this specific sense, conceives of God as personal, present and active in the governance and organization of the world and the universe. The use of the word theism as indicating a particular doctrine of monotheism arose in the wake of the scientific revolution of the seventeenth century to contrast with the then emerging deism that contended that God, though transcendent and supreme, did not intervene in the natural world and could be known rationally but not via revelation.
The term theism derives from the Greek theos meaning God. The term theism was first used by Ralph Cudworth (1617–1688). The claim of no knowledge, no faith, and a complete rejection of theism is known as agnosticism, atheism, and antitheism, respectively.