The Transcendental Argument for the Existence of God (TAG) is the argument that attempts to prove God's existence by arguing that logic, morals, and science ultimately presuppose a deistic worldview, and that God is the source of logic and morals. A version was formulated by Immanuel Kant in his 1763 work The Only Possible Argument in Support of a Demonstration of the Existence of God. A version is also commonly used in presuppositional apologetics and is considered by some apologists to be the most persuasive argument.
Transcendental arguments should not be confused with transcendent arguments, or arguments for the existence of something transcendent. In other words, they are distinct from both arguments that appeal to a transcendent intuition or sense as evidence (Fideism), and arguments that move from direct evidence to the existence of a transcendent thing (Classical Apologetics).
They are also distinct from standard deductive and inductive forms of reasoning. Where a standard deductive argument looks for what we can deduce from the fact of X, and a standard inductive argument looks for what we can infer from experience of X, a transcendental argument looks for the necessary prior conditions to both the fact and experience of X. Thus, "I entitle transcendental all knowledge which is occupied not so much with objects as with the mode of our knowledge of objects insofar as this mode of knowledge is to be possible a priori." (Immanuel Kant, Critique of Pure Reason, Introduction, VII).
The TAG is a transcendental argument that attempts to prove that the Christian God is the precondition of all human knowledge and experience, by demonstrating the impossibility of the contrary; in other words, that logic, reason, or morality cannot exist without God. The argument proceeds as follows:
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