Why God Cannot Exist Using Descartes Arguements

Why God Cannot Exist Using Descartes’ ArguementsPhilosophy 300
Sam Black
God Cannot Exist Using Descartes’ Argument
Steve Cara
JIBC/SFU Cohort #1
May 25th, 2000
Descartes sets about proving the existence of God through his meditations on knowledge in an effort to prove the skeptics of his time wrong. He first determines that human knowledge is based entirely too much on unproved presuppositions. He argues that this makes it difficult to distinguish between truth and error, since we cannot recognize true knowledge. Descartes proposes that the quest for knowledge must be based upon universal doubt. Specifically, he proposes the following in relation to his universal methodic doubt:
1. In order to seek truth, it is necessary once in the course of our life, to doubt, as far as possible, of all things.

2. We ought also to consider as false all that is doubtful.

3. We ought not meanwhile to make use of doubt in the conduct of life?
4. Why we may doubt of sensible things.

5. Why we may also doubt of mathematical demonstrations.

6. We cannot doubt of our existence while we doubt, and this is the first knowledge we acquire when we philosophize in order.

Descartes proceeded to strip away his knowledge base in order to determine the one indubitable fact, Cogito, ergo sum. From this absolute knowledge of his own existence, he set about deducing the existence of God through ontological argument.

? In our minds, the idea of God is one of an infinitely perfect Being
? An infinitely perfect being must have existence, otherwise it would not be infinitely perfect.

? Therefore, God exists.

In proving the existence of God, Descartes set the groundwork for determining that God created man. He further postulated that God, being infinitely perfect and not a deceiver, could not have provided man with the deceptive powers of knowledge. Therefore, man’s mental faculties are determined to be trustworthy provided we separate what there is of clear and distinct in the knowledge from what is obscure and confused. Using this reasoning, man must discard all previous knowledge which is doubt-ridden, all sensory-based knowledge (as perceptions can be misleading), and all intellection. As a result, skepticism is removed and valid knowledge possible.

Descartes primary purpose was the defense of human knowledge against the attacks of the skeptics. He was justified in excluding preconceived notions, presuppositions, and traditions in determining the limits of knowledge. Descartes discarded the ability of the mind to know truth and the human abilities of contradiction and sufficient reason. In doing so, he made a solution to the problem impossible.

As it relates to his theory of the existence of God, Descartes universal doubt refutes his own conclusion as to God’s existence. Descartes formed an idea of God as an infinitely good being. He would have had to discover this idea within his own mind. According to his principle of universal doubt, he cannot simply know whether his conception of God is correct or incorrect. He would have, as a matter of his own principle, considered it as false until proven otherwise. Therefore, since the idea of God is in doubt, the trustworthiness of man’s reasoning must also be doubtful and Descartes cannot escape his own real doubt.

Descartes uses a process of reasoning, a mathematical formulae, in attempting to demonstrate God’s existence. If his reasoning is of demonstrably doubtful validity, how can Descartes demonstrate God’s existence? The validity of Descartes reasoning is supposed to flow as a consequence of the infinite perfection of God; and God’s infinite perfect is made certain through Descartes’ reasoning powers before he has even proven that these reasoning powers are valid and trustworthy. Descartes assumes the very thing beforehand which he intends to prove afterwards. (Begging the question).

Descartes accepts the trustworthiness of his faculties in demonstrating the existence and infinite perfection of God, and that is illegitimate. A doubtfully valid faculty will produce a doubtfully valid argument which will, in turn, produce a doubtfully valid conclusion. The entire argument for God’s existence is therefore nullified by a suspect reasoning process. Since he proves the reliability of his reason and process by means of God’s veracity, the proof of his reliability cannot be established beyond doubt.

Thus, Descartes attempt to vindicate the validity of human knowledge failed, because, by rejecting the reliability of his own powers