Essay Does God Exist Philosophy

Author: Andrew Chapman
Category: Philosophy of Religion
Word Count: 1000

God’s Greatness

The Abrahamic conception of God is that he’s awesome—all-powerful, all-knowing, all-good, creator of the universe, self-existent, and a host of other properties that make him not just very, very great, but the greatest that there is or could possibly be.

“This is all fine and good,” say non-theists, “but this is a description of a being whose existence we don’t affirm.” However, a famous and powerful argument for God’s existence known as the Ontological Argument purports to be able to show that God’s being the greatest possible being entails God’s existence. The mere definition of God proves his existence.

Anselm’s Ontological Argument

While there are different versions of the Ontological Argument, I will here focus on one of the earliest: that set forth by St. Anselm.1

As we’ve already noted, God is the being than which no greater can be conceived. This is Anselm’s somewhat unwieldy description of God, which I will abbreviate BNGC. By definition, BNGC is the greatest conceivable being. If you think you’re conceiving of God and you can possibly conceive of a greater being, then you weren’t initially conceiving of God. Simple enough.

Now, certainly you can conceive of God. To conceive of something is just to think about it clearly and distinctly; you’ve been doing that since the beginning of this essay. So we know, at least, that God can exist in conception, i.e., can be conceived. Even the atheist should admit this. What the atheist is denying, and what the agnostic is refusing to affirm or deny, is that God existsin reality. So we have an intuitive distinction between a thing that existsmerely in conception and a thing that exists in realityas well as in conception.

Now here’s the meat of the argument: Assume that the atheist is right, that God doesn’t exist in reality, but merely in conception. But then there would be another possible being, a God who exists not merely in conception but also in reality as well, who is greater than BNGC.2 That is, there would be a possible being who is greater than the being than which no greater can be conceived. But no being can be greater than the being than which no greater can be conceived—that’s a flat-out contradiction! So our original assumption, that God doesn’t exist in reality, but merely in conception, must be false, since any assumption that entails a contradiction must be false. Therefore, God must exist both in conception and in reality. Therefore: God exists.3

The Ontological Argument is remarkable in that it reasons from premises containing only definitions and logical laws to perhaps the grandest philosophical conclusion there is. We can know that God exists merely by reflecting on the concept of God.

Many people, however, have been uncomfortable with the purported fact that we can prove the Almighty’s existence so apparently simply. Numerous critics, theist and non- alike, have criticized different aspects Ontological Argument. Here, I will look at just two of the most influential criticisms: those provided by Gaunilo of Marmoutiers and Immanuel Kant.

Gaunilo’s Criticism

Gaunilo was a monk and a contemporary of Anselm’s. In his “Reply on Behalf of the Fool,”4 Gaunilo has us imagine another really awesome thing: the island than which no greater can be conceived—let’s call it ‘INGC.’ This island has all the amazing-making properties you can think of: pristine white-sand beaches for lounging, warm water for swimming, and not a tourist in sight. But certainly such an island’s existing only in conception would entail a contradiction, since then there would be a possible thing greater than the INGC, namely, the existing INGC. Therefore, the INGC exists. And, of course, since we have picked island arbitrarily, we can run the same argument for any object: a building, a mousetrap, a horse, whatever you please.5

What Gaunilo has shown, then, is that, using Anselm’s form of reasoning, we can prove the existence of all sorts of bizarre entities, entities that clearly don’t exist. Accordingly, concludes Gaunilo, there must be something fatally wrong with Anselm’s reasoning.6

Kant’s Criticism

Which do you prefer, coffee or existing coffee? Notice that this is different from the question of whether you prefer coffee or no coffee at all. No coffee isn’t coffee while both coffee and existing coffee are coffee just the same! If it seems like we’re verging on Lewis Carroll-style nonsense here, you’re right, and this is exactly Kant’s criticism of the Ontological Argument.

According to Kant in his Critique of Pure Reason, what’s gone wrong with Anselm’s argument lies in the distinction between a thing that existsmerely in conception and a thing that exists in realityas well as in conception. According to Anselm, there are two different sorts of things: those that exist merely in conception and those that exist in reality as well as in conception. But an existing thing and its non-existing counterpart aren’t two different sorts of thing—one merely exists and the other doesn’t. While it is certainly true that some things exist and others do not, existing does not make a thing a different kind of thing from its non-existing colleague.

The upshot of this, says Kant, is that existence is a very special type of property, one not suited for the type of argument Anselm is running. Since there is no difference between the group of objects falling into the class God and those falling into the class existing God, an existing God can be no better and no worse than a mere God. There’s simply no relevant difference in kind between a God who exists and a God who doesn’t.


Of course, Gaunilo and Kant have not had the last word in this debate. Powerful arguments have been mounted in response to Gaunilo’s and Kant’s criticisms of the Ontological Argument. Additionally, increasingly complex versions of the Ontological Argument have been developed and debated. One thing that’s certain is that the Ontological Argument, whether sound or unsound, is a fascinating and powerful attempt at a proof for the existence of God.


1Two other famous formulations of the argument are Descartes’s formulation from the conception of existence as a perfection and Alvin Plantinga’s so-called Modal Ontological Argument.

2Which is greater, a God who exists merely in conception or a God who exists in reality as well as in conception? Think of all the things a God who exists in reality as well as in conception can do that a God who exists merely in conception cannot do: He can create worlds. He can listen to prayers. He can be the ultimate source and ideal form of goodness. He can reward virtuousness and punish vice… Those all seem like great things, and a God who exists merely in conception can do none of them.

3You may remember this type of argument or proof from your geometry courses where it was called an indirect proof. Philosophers and logicians call this a reductio ad absurdum, or a reduction to absurdity. The strategy, as you have seen, is to assume the opposite of what you are trying to prove, show how that assumption entails either a contradiction or some other form of absurdity, and then to reject the original assumption.

4“The fool has said in his heart, ‘There is no God.’” (Psalm 14:1)

5It’s important to note that we’re not merely talking here about the greatest actually existing island, mousetrap, horse…, but the greatest possible island, mousetrap, horse… It is plausible that for any type of existing object, one of the ones that exists is the best one (in terms of whatever makes that sort of thing a good one of what it is). But it is another thing altogether to talk about the greatest possible or greatest conceivable such object.

6Notice that Gaunilo’s argument is also a reductio ad absurdum: Assume that Anselm’s reasoning is valid and an absurdity results. Therefore, Anselm’s reasoning must be flawed.


Anselm, St., Proslogion, in St. Anselm’s Proslogion, M. Charlesworth (ed.), Oxford: OUP, 1965.

Descartes, R., Discourse on Method and The Meditations, translated with an introduction by F. Sutcliffe, Harmondsworth: Penguin, 1968.

Gaunilo, “On Behalf of the Fool”, in St. Anselm’s Proslogion, M. Charlesworth (ed.), Oxford: OUP, 1965.

Kant, Immanuel. Critique of Pure Reason. Trans. Paul Guyer and Allen W. Wood. Cambridge: Cambridge UP, 1998.

Oppy, Graham. “Ontological Arguments.” Stanford Encyclopedia of Philosophy. Stanford University, 08 Feb. 1996. Web. 27 June 2014. <>.

Plantinga, Alvin. The Nature of Necessity. Oxford: Clarendon, 1974.

About the Author

Andrew is a lecturer in philosophy at the University of Colorado, Boulder. He holds a PhD in philosophy from the University of Colorado, Boulder, an MA in philosophy from Northern Illinois University and a BA in philosophy and a BM in bassoon and sound recording technology from Ithaca College. He specializes in epistemology, metaethics, and the history of philosophy (especially Kant and the 20th Century Anglophone and Phenomenological traditions). When not philosophizing, Andrew is skiing, hiking, listening to great music, or playing the bassoon.

by 1000wordphilosophy

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Does God Exist?

Does God Exist?: The Debate Between Theists and Atheists by J.P. Moreland & Kai Neilsen, with additional contributions. A review by Sue Johnson.

This book consists of transcripts of two debates, including questions from the floor, between J.P. Moreland (theist) and Kai Nielsen (atheist) on the questions ‘Does God exist?’ and ‘Do ethics depend on God?’. The transcripts are followed by contributions in response from William Lane Craig, Antony Flew, Keith Parsons and Dallas Willard. Peter Kreeft provides the Introduction and Conclusion.

The existence (or non-existence) of God and the foundation of ethics are two perennially live issues, and this is a readable account of many of the main points, suitable for ‘A’ level students, undergraduates or general interest readers.

The debates are not as useful as they could be, a fact acknowledged by Kai Nielsen, owing to the differences in approach of the main protagonists.

In the first debate, Professor Moreland begins by apparently claiming that one is within one’s epistemic rights to believe in God – in other words, that it isn’t illogical to believe in God given the evidence available. This seems like a fairly weak claim! His reported speech shows, however, that he is actually claiming something along the lines that God’s existence is probable, although not certain. He refers, rather briefly in some cases, to the teleological, moral and cosmological arguments, and he uses scientific discoveries and theories, including the second law of thermodynamics and quantum theory, to bolster his case for God’s existence. He spends rather more time on archaeological confirmations of Biblical narrative, on the putative validity of the resurrection accounts, and on the argument from religious experience, including his own. “I have had close to two decades of walking with Him [Jesus Christ] … and falling more and more in love with Him daily…”, he says – a testimony which jars oddly in style with the rest of his argument. Nielsen, by contrast, adopts a linguistic approach, contending that theological language in general, and the term ‘God’ in particular, is incoherent. There is little, therefore, in the way of rebuttal of argument in the debate as recorded; rather, each contributor makes his own assertions, supported by argument and evidence.

Nonetheless, each of them makes interesting points in an accessible way, although the complete beginner in philosophy of religion would do well to consult a standard text (eg The Existence of God, edited by John Hick) for fuller statements of the arguments under discussion. Both Moreland and Nielsen then spoke briefly in rebuttal of the major arguments of the opposition, and then again to close the case on each side.

There follow transcripts of questions from the floor and the answers from the speakers. Some of the questions were quite subtle, and some interesting points were made – on both sides – in response.

The issues raised ranged across the fields of linguistics, religious experience, the possibility of various forms of personal survival after bodily death, cosmology and the evidence for agnosticism rather than atheism, with incidental matters arising en route.

The debate on ethics was briefer, and once again there was little rebuttal of argument in the main speeches. From the preamble, it was apparent that this wasn’t the fault of the protagonists, since Moreland was required to reply to Nielsen without previous sight of Nielsen’s text. Nielsen argues that either an atheist existentialist view (eg Sartre’s) is coherent, or that, with Camus, one can “fight the plague”, ie “Even if” like Camus, “you are sceptical about transforming the world, at least you can try to cut back some of the evil in the world, and sometimes you can succeed in some measure.” (The specific evil which Camus opposed was Nazism: he was a leading member of the French Resistance during WWII. He did however use ‘fighting the plague’ as a general term for active opposition to evil). Nielsen asserts that knowledge of what is good and what is evil is accessible through reason: “You start with these considered judgements. You get them into a coherent packet with themselves and with everything else we know; that’s as much – indeed it’s the only kind – of objectivity I think you can get in ethics.”

Moreland’s response is that, without an Ultimate Good (ie, God), there is no reason to choose one course of action rather than another, and that this defeats the atheist’s claim to be able – or necessarily willing – to lead a moral life. For Moreland, moral absolutes exist, while Nielsen thinks they do not, but Nielsen, as a Marxist, believes that people will make choices which are ultimately beneficent rather than otherwise. This debate was shorter and less satisfactory than the first, and was followed by a brief question time – “about twelve or thirteen minutes”. I was left with the impression that shortness of time had led to superficiality of treatment of a large subject.

The arguments suffered from being transcripted debates rather than written papers, and the questions and answers would have benefited from editing in the interests of easier reading.

The responses from other philosophers were extremely valuable in setting the arguments in context. It has to be said that scholarly standards were better upheld by the atheists than the theists, but none of the contributions was without merit or interest. Both Moreland and Nielsen replied to the comments of the additional contributors.

Peter Kreeft’s introduction and conclusion are masterly. The introduction would in itself make a good revision handout for the Philosophy of Religion component of the ‘A’ level course. The copious footnotes and references provided throughout the book invite the reader to further study and are a major strength of the publication. A valuable bibliography is provided, but, sadly, there is no index. This is a surprising omission in view of the general quality of the book.

Altogether, a book well worth reading for anyone who is not already thoroughly familiar with the subject. I have only ever encountered one person who has claimed to be converted from disbelief to belief by rational argument and the belief in question was Buddhism, not a personal theism. This book is as unlikely to make converts as any other, but it does make a worthwhile contribution to the ongoing debate.

© Sue Johnson 1997

Does God Exist? is published in paperback by Prometheus Books. ISBN 0-87975-823-6 £14.50

Sue Johnson is Head of Religious Studies and Philosophy at The Grammar School for Girls, Wilmington, Kent.

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