handout from my philosophy of religion class, also on the handouts page.
Basic Arguments for God's Existence
Each of these basic strategies supports numerous formulations, and there are other strategies as well.
The Ontological Argument (Anselm, e.g.)
The term 'God' refers to the greatest possible being.
A being which exists is greater than a being which does not exist.
Therefore, God exists.
(The ontological argument is a priori, deductive, and has the advantage not only of proving (if it proves anything) that God is morally perfect, omniscient, omnipotent, and so on.)
The Cosmological Argument (Aquinas etc)
Version (a): First Cause
Every motion, event, or object must have a cause.
There cannot be a temporally infinite chain of causation.
Therefore, there must be a first cause that is not itself caused by anything else ("and this all people call God.")
Version (b): from the principle of sufficient reason
For every event and object, there is in principle an adequate reason or explanation.
This is true not only of each specific thing and event but of the whole series or array.
Therefore there must be something in terms of which the whole universe or causal sequence can be explained (say, "the will of God")
(The cosmological argument is a posteriori in the sense that it supposes (from experience) that there things, events, and so on. But it is usually framed deductively.)
The Teleological Argument or The Argument from Design
The universe displays such elements of physical or moral order or purpose that it would be irrational to believe that it was the result of chance rather than intentional design.
This is often framed as an argument from analogy: say we found a watch on the beach; we'd conclude it was the result of someone's purposeful design and manufacture. How much more elaborate and beautiful etc is the world!
(The teleological argument is a posteriori and inductive or abductive.)
Definitions
a priori knowledge is knowledge that is not based on sensory (empirical) observation. Examples include principles of mathematics and logic.
a posteriori knowledge is emprical knowledge, knowledge based on sensory experience.
deductive arguments are arguments in which it is supposed that if the premises are true, the conclusion cannot be rationally denied. E.g. All men are mortal. Fred is a man. Therefore, Fred is mortal.
inductive arguments rest on enumerating observations. For example, all the crows we have observed are black. Therefore, the next crow we observe will be black. Though the premise lends probability to the conclusion, the premise(s) could be true and the conclusion false.
abductive arguments are arguments from analogy, concluding from the fact that two items are similar in certain respects, they are similar in other respects. For example, since rats are like people (in some respects), if a substance cures cancer in rats, it is likely to cure cancer in people.
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