Originally posted by: SacrosanctFiend
If anyone feels like a rational debate (which at this point is unlikely), find flaws with the following:
Ontological Argument - Anselm
1. God exists in our understanding. This means that the concept of God resides as an idea in our minds.
2. God is a possible being, and might exist in reality. He is possible because the concept of God does not bear internal contradictions.
3. If something exists exclusively in our understanding and might have existed in reality then it might have been greater. This simply means that something that exists in reality is perfect (or great). Something that is only a concept in our minds could be greater by actually existing.
4. Suppose (theoretically) that God only exists in our understanding and not in reality.
5. If this were true, then it would be possible for God to be greater then he is (follows from premise #3).
6. This would mean that God is a being in which a greater is possible.
7. This is absurd because God, a being in which none greater is possible, is a being in which a greater is possible. Herein lies the contradiction.
8. Thus it follows that it is false for God to only exist in our understanding.
9. Hence God exists in reality as well as our understanding.
Cosmological Argument - Aquinas (shortened)
1. Every being (that exists or ever did exist) is either a dependent being or a self-existent being.
2. Not every being can be a dependent being.
3. So there exists a self-existent being.
Teleological Argument - Aquinas
"We see that things that lack intelligence, such as natural bodies, act for an end, and this is evident from their acting always, or nearly always, in the same way, so as to obtain the best result. Hence it is plain that not fortuitously, but designedly, do they achieve their end. Now whatever lacks intelligence cannot move towards an end, unless it be directed by some being endowed with knowledge and intelligence; as the arrow is shot to its mark by the archer. Therefore some intelligent being exists by whom all natural things are directed to their end; and this being we call God."