Natural and Deductive Theology

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.