The central claim of theism is that God exists. According to a standard version of this doctrine, God is omniscient, omnipotent, perfectly good, and the creator of all contingent things. According to more developed versions, God intervenes in the created world in order to answer prayers and perform miracles. Developed versions of theism are often contrasted with deism because deists hold that God created the contingent world but does not subsequently intervene in it.

Various aspects of theism are discussed in the following articles in the Encyclopedia:

Agnosticism; Analogy in Theology; Atheism; Common Consent Arguments for the Existence of God; Cosmological Arguments for the Existence of God; Creation and Conservation, Religious Doctrine of; Degrees of Perfection, Argument for the Existence of God; Deism; Epistemology, Religious; Evil, The Problem of; Faith; Fideism; Foreknowledge and Freedom, Theological Problem of; God, Concepts of; Hiddenness of God; Infinity in Theology and Metaphysics; Miracles; Moral Arguments for the Existence of God; Mysticism, Nature and Assessment of; Ontological Argument for the Existence of God; Pantheism; Perfection; Philosophy of Religion; Philosophy of Religion, Problems of; Physicotheology; Popular Arguments for the Existence of God; Providence; Religious Experience; Religious Experience, Argument for the Existence of God; Revelation; Teleological Argument for the Existence of God; Theism, Arguments For and Against.