Arguments for the Existence of God
Over the centuries, there have been many attempts by religious philosophers to prove the existence of God, and a canon of classic arguments has been developed. Not all of these arguments have their origins in Christian philosophy; Jewish and Muslim philosophers have made significant contributions to the philosophy of religion, and both Plato and Aristotle have influenced its development.
Recent decades have seen a rise in interest in natural theology and the philosophy of religion. Each of the classic theistic proofs has been revived and refined, presented in revised form and defended afresh. Whether any of these arguments for the existence of God is successful, of course, remains controversial.
The Arguments for the Existence of God section sets out to explain each of the common philosophical arguments for theism, and so to explore the case for the existence of God.
Arguments for the Existence of God
The arguments themselves are arranged under the following headings: Pascal’s Wager, The Ontological Argument, The Cosmological Argument (including the first cause argument), The Teleological Argument (i.e. the argument from design), The Moral Argument, and The Argument from Religious Experience.
There are, however, two preliminary issues to be dealt with: the intrinsic probability of the existence of God, which will bear on the degree of suspicion with which we view the purported theistic proofs, and reformed epistemology, which holds that belief in God can be rational even if it cannot be supported by evidence.
Pascal’s Wager
Pascal’s Wager is an argument for belief in God based not on an appeal to evidence that God exists but rather based on an appeal to self-interest. It is in our interests to believe in God, the argument suggests, and it is therefore rational for us to do so.
The claim that it is in our interests to believe in God is supported by a consideration of the possible consequences of belief and unbelief. If we believe in God, the argument runs, then if he exists then we will receive an infinite reward in heaven while if he does not then we have lost little or nothing.
If we do not believe in God, the argument continues, then if he exists then we will receive an infinite punishment in hell while he does not then we will have gained little or nothing.
Either receiving an infinite reward in heaven or losing little or nothing is clearly preferable to either receiving an infinite punishment in hell or gaining little or nothing. It is therefore in our interests, and so rational, to believe in God.
The Ontological Argument
The ontological argument is an argument that attempts to prove the existence of God through abstract reasoning alone. The argument begins with an explication of the concept of God. Part of what we mean when we speak of “God” is “perfect being”; that is what the word “God” means. A God that exists, of course, is better than a God that doesn’t. To speak of God as a perfect being is therefore to imply that he exists. If God’s perfection is a part of the concept of God, though, and if God’s perfection implies God’s existence, then God’s existence is implied by the concept of God. When we speak of “God” we cannot but speak of a being that exists. To say that God does not exist is to contradict oneself; it is literally to speak nonsense.
The Cosmological Argument
The cosmological argument is the argument from the existence of the world or universe to the existence of a being that brought it into and keeps it in existence. It comes in two forms, one modal (having to do with possibility and the other temporal (having to do with time).
The modal cosmological argument, the argument from contingency, suggests that because the universe might not have existed (i.e. is contingent), we need some explanation of why it does. Whereever there are two possibilities, it suggests, something must determine which of those possibilities is realised. As the universe is contingent, then, there must be some reason for its existence; it must have a cause. In fact, the only kind of being whose existence requires no explanation is a necessary being, a being that could not have failed to exist. The ultimate cause of everything must therefore be a necessary being, such as God.
The temporal kalam cosmological argument, begins by arguing that the past is finite. The idea that the universe has an infinite past stretching back in time into infinity is, the argument notes, both philosophically and scientifically problematic; all indications are that there is a point in time at which the universe began to exist. This beginning must either have been caused or uncaused. It cannot have been uncaused, though, for the idea of an uncaused event is absurd; nothing comes from nothing. The universe must therefore have been brought into existence by something outside it. The kalam argument thus confirms one element of Christianity, the doctrine of Crea
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