epistemology Epistemology (; ), or the theory of knowledge, is the branch of philosophy concerned with knowledge. Epistemology is considered a major subfield of philosophy, along with other major subfields such as ethics, logic, and metaphysics. Epis ...

, a presupposition relates to a belief system, or

Weltanschauung A worldview or world-view or ''Weltanschauung'' is the fundamental cognitive orientation of an individual or society encompassing the whole of the individual's or society's knowledge, culture, and point of view. A worldview can include natural ...

, that is required for the argument to make sense. A variety of Christian

apologetics Apologetics (from Greek , "speaking in defense") is the religious discipline of defending religious doctrines through systematic argumentation and discourse. Early Christian writers (c. 120–220) who defended their beliefs against critics an ...

, called

presuppositional apologetics Presuppositionalism is an epistemological school of Christian apologetics that examines the presuppositions on which worldviews are based, and invites comparison and contrast between the results of those presuppositions. It claims that apart from ...

, argues that the existence or non-existence of

God In monotheistic thought, God is usually viewed as the supreme being, creator, and principal object of faith. Swinburne, R.G. "God" in Honderich, Ted. (ed)''The Oxford Companion to Philosophy'', Oxford University Press, 1995. God is typically ...

is the basic presupposition of all human thought, and that all people arrive at a worldview which is ultimately determined by the theology they presuppose. Evidence and arguments are only developed after the fact in an attempt to justify the theological assumptions already made. According to this view, it is impossible to demonstrate the existence of God unless one presupposes that God exists, with the stance that modern

science Science is a systematic endeavor that Scientific method, builds and organizes knowledge in the form of Testability, testable explanations and predictions about the universe. Science may be as old as the human species, and some of the earli ...

relies on

methodological naturalism In philosophy, naturalism is the idea or belief that only natural laws and forces (as opposed to supernatural ones) operate in the universe. According to philosopher Steven Lockwood, naturalism can be separated into an ontological sense and a me ...

, and thus is incapable of discovering the supernatural. It thereby fashions a Procrustean bed which rejects any observation which would disprove the naturalistic assumption. Apologetics argue that the resulting worldview is inconsistent with itself and therefore irrational (for example, via the Argument from morality or via the

Transcendental argument for the existence of God The Transcendental Argument for the Existence of God (TAG) is the argument that attempts to prove the existence of God by arguing that logic, morals, and science ultimately presuppose a supreme being and that God must therefore be the source of l ...

See also