Arguments for the Existence of God
Philosophers have tried to provide rational proofs of God's existence that go beyond dogmatic assertion or appeal to ancient scripture. The major proofs, with their corresponding objections, are as follows:
1. Ontological:
It is possible to imagine a perfect being. Such a being could not be perfect unless its essence included existence. Therefore a perfect being must exist.
Objection: You cannot define or imagine a thing into existence.
2. Causal:
Everything must have a cause. It is impossible to continue backwards to infinity with causes, therefore there must have been a first cause which was not conditioned by any other cause. That cause must be God.
Objections: If you allow one thing to exist without cause, you contradict your own premise. And if you do, there is no reason why the universe should not be the one thing that exists or originates without cause.
3. Design:
Animals, plants and planets show clear signs of being designed for specific ends, therefore there must have been a designer.
Objection: The
principles of self-organization and evolution provide complete explanations for apparent design.
3a. Modern design argument:
the Anthropic Cosmological Principle. This is the strongest card in the theist hand. The laws of the universe seem to have been framed in such a way that stars and planets will form and life can emerge. Many constants of nature appear to be very finely tuned for this, and the odds against this happening by chance are astronomical.
Objections: The odds against
all possible universes are equally astronomical, yet one of them must be the actual universe. Moreover, if there are very many universes, then some of these will contain the possibility of life. Even if valid, the anthropic cosmological principle guarantees only that stars and planets and life will emerge - not intelligent life. In its weak form, the anthropic cosmological principle merely states that if we are here to observe the universe, it follows that the universe must have properties that permit intelligent
life to emerge.
4. Experiential:
A very large number of people claim to have personal religious experiences of God.
Objections: We cannot assume that everything imagined in mental experiences (which include dreams, hallucinations etc) actually exists. Such experiences cannot be repeated, tested or publicly verified. Mystical and other personal experiences can be explained by other causes.
5. Pragmatic:
Human societies require
ethics to survive. Ethics are more effectively enforced if people fear God and Hell and hope for Heaven (cf. the
origin of ethical systems).
Objections: The usefulness of a belief does not prove its truth. In any case, many societies have thrived without these beliefs, while crime has thrived in theistic societies believing in heaven and hell.
General objection against all the rational proofs for God:
Each of the above arguments is independent of the others and cannot logically be used to reinforce the others.
The cause argument - even if it were valid - would prove only a first cause. It would tell us nothing about the nature of that cause, nor whether the cause was mental or physical. It would not prove that the first cause was the personal, judging, forgiving God of Judaism, Christianity, or Islam. It would not prove the existence of a designer or of a perfect being. Equally, the design argument would prove only a designer, the ontological argument would prove only the existence of a perfect being, and so on. None of these arguments individually can prove that the cause, designer or perfect being were one and the same - they could be three different beings.