|Reading for Philosophical Inquiry: A Brief Introduction to Philosophical Thinking ver. 0.21; An Open Source Reader|
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Philosophers investigate two broad kinds of religious knowledge claims:
First, natural theology is the attempt to prove the existence of God, and sometimes human immortality, from premisses provided by observation of the ordinary course of nature. Natural theology usually involves à posteriori proofs.
Second, deductive theology involves the attempt to prove the existence of God from premisses known to be true by reason alone; that is the reasoning is done independently of sensory experience and is called à priori reasoning.