This is the first in a series of posts deconstructing and refuting some common arguments in favor of theism, religion, faith, etc. This article will feature the so-called “TAG,” or Transcendental Argument for the Existence of God. This is the argument employed by Prussian philosopher & anthropologist Immanuel Kant in his 1763 book, Der einzig mögliche Beweisgrund zu einer Demonstration des Daseins Gottes (The Only Possible Argument in Support of a Demonstration of God’s Existence). Put simply, it goes like this:
(1) If reason exists then God exists.
(2) Reason exists.
(3) Therefore, God exists.
It is sometimes called the presuppositionalist argument as well. Additionally, you can replace “reason” with “knowledge,” “objective morality,” “logic,” “the universe,” or pretty much anything else you want.
There are several common criticisms against this one. The first is that it doesn’t demonstrate any specific god or gods. You could just as easily replace “God” with any other deity and “prove” that one is real, instead. It should be noted that parsimony requires the postulation of one god rather than more than one god, unless you have evidence to the contrary (and really, if we had evidence at all, we wouldn’t need to play these logic games to try to prove a god in the first place). It’s simply more likely that there’s only one god for which there is no evidence that they there are multiple gods for which there are no evidence, in the same way that (even though both are false), Judaism is more likely to be true than Christianity, since Judaism requires that you believe the Old Testament, whereas Christianity requires that you believe both the Old and New Testaments. The more layers of unsubstantiated crap you pile on, the less likely something is to be true.
Another criticism is the assertion that reason exists. If we’re going to use logic, we kind-of have to agree that reason exists. When theists try to use “objective morality” or “knowledge” in place of “reason,” it gets a little easier to refute. There’s no good evidence that objective morality exists, and if you’re skilled at arguing as a global skeptic, demonstrating that the existence knowledge is unprovable isn’t too difficult – this just gets down to an epistemological discussion, which is beyond the scope of this article.
(1) is more or less a bare assertion fallacy. There’s no good evidential or logical reason to justify the statement that if reason/morality/logic/the universe/whatever exists, then [a] god exists. Someone making this argument would have to explain why the existence of reason is dependent on the existent of god. The two aren’t logically linked and we have no reason to believe they are, any more than we have reason to believe, for example, that if people with the ability to type exist, computer exist. There are other explanations for how people with the ability to type came into existence – for example, the existence of typewriters would explain this, as well.
I tend not to argue too much about (2) unless someone claims that objective morality exists. Then I would ask, what’s your evidence for this? What is objective morality? How do you know that? It seems to be another bare assertion.
(3) is, again, a non sequitur relating to (1). There is no logical link between the existence of reason etc and the existence of (any) god. Reason could be explained just as well (more parsimoniously, in fact) by arguing that it evolved as an emergent property of sufficiently complex brains, the same as consciousness. You can also argue this with morality, using the evolution of cooperation & game theory (for more info about this, I highly recommend Axelrod’s The Evolution of Cooperation and Ridley’s The Origins of Virtue).
Ultimately, this argument boils down to a quite simple refutation: It’s an “ipse-dixitism” fallacy that “If (x) exists, God must exist.” That’s just an a priori, unsubstantiated assertion. You could just as easily assert that “If (x) exists, Santa Claus exists.” The two aren’t causally or logically linked. Since (1) contains a fallacy, the argument is invalid, and cannot serve as a sound proof of the existence of the Judeo-Christian-Islamic God (or any other god or gods).
Until next time,