Originally posted by Dr McBeefington
I bet I could make a rational argument for the [b]possibility of the existence of God, using the Jewish people as an example. I think we can both agree that you don't need scientific evidence for something to be rational or at least be a good possibility. [/B]
There is always the possibility that god exists; however, the most common a priori arguments are the Ontological Argument, TAG (including Kant's moral variation,) and the Cosmological Argument.
The Cosmological Argument states that because everything has a cause, something must have caused the Universe (I.E God.) TAG states that the very existence of logic and reason presupposes the existence of God because without God, logic and reason are meaningless because then we are nothing more than matter an energy.
The Ontological argument sort of states that if we can conceive of God, God must exist because God is a perfect being. The idea being that the very ability to conceive of a perfect being requires that perfect being to exist.