Exposing PseudoAstronomy

November 14, 2008

Logical Analysis of the Cosmological Argument for the Existence of God


Introduction

As I’ve stated before (like here or here), creationists often use a seeming leap of scientific faith to justify a “proof” for the existence of God from somewhere within the Big Bang theory. So far, I’ve argued against specific scientific claims that would seem (to their proponents) to show why we need something divine to justify our existence.

In this post, however, I’m going to examine this from a purely logical standpoint, critiquing what apparently is known as the “Cosmological Argument” for the existence of (a) G/god(s).

The Claim

The Cosmological Argument actually has its roots at least as far back as Plato and Aristotle, over 2300 years ago. The main premise is that everything (all effects) must have a cause.

There are many different ways of positing the argument, some involve 6 steps, some 4 steps, and some 3 steps (like the one below). They all pretty much say the same thing.

Therefore, I’m going to go with the easier 3-step one, and I am specifically taking my cues for the version of this argument from this person’s blog post:

(1) The universe exists, and there must be an explanation for why it exists.

(2) There are only three possible explanations for why the universe exists: (a) It has always existed. (b) It created itself. (c) It was created by something outside of itself.

(3) Explanation (a) has serious scientific and philosophical problems. Explanation (b) is absurd. Therefore, the universe was created by God.

Critique

Part 1: From a philosophical argument, there really doesn’t need to be an explanation for why something exists. It could just exist. I choose to take 2 steps at a time occasionally “just ’cause,” there really doesn’t need to be any specific reason. So right off the bat, we have a faulty major premise.

If you choose to interpret this from a cause-and-effect argument – the “effect” of the universe existing must have a cause – I would argue that this is not necessarily true. Science’s current concept of the “universe” is, by definition, “everything” and that includes space and time. Therefore, if time did not exist “before” the universe formed, how could there be a cause?

Some may argue that this itself is a logical fallacy of “Special Pleading,” meaning that in this one particular case I am arguing that the rules by which we live and are normally subject to don’t really apply in this special case. I would partially agree with this … however, I would also make the point that the formation of the cosmos is a special case, and the rules by which we live now were likely not in existence “before” the universe came into existence.

Part 2: I would agree that, logically, the three possible explanations for “why” the universe exists are likely correct, though I would point out that this could be a case of the “False Dichotomy” (or I guess “false trichotomy”) logical fallacy: Those three options may not actually be all the possible explanations. We may just not know, especially considering that we’re talking about something that happened “before” the creation of our universe. But let’s examine each of them, anyway:

Part 3: I would agree that, taken at its face, 2(a) does have some scientific problems. Evidence that I have talked about before does seem to show that the universe – at least as we now know it – had a definite beginning. However, that may not actually be the case. Stephen Hawking has posited the idea that the universe and time may be closed, but unbound. To get an idea about what this means, think of a sphere: You could walk along the surface of a sphere literally forever and never come to the edge of it. Therefore it’s closed (it’s a finite size) but unbound (the geometry has no edges, no beginning nor end).

To say that 2(b) is “absurd” is an ad hominem logical fallacy that just ridicules it without providing a reason why it would be false, rather just implying that its false by name-calling. Granted, this is akin to the “Grandfather” paradox of time travel, where it sometimes is put such that you can’t go back in time and kill your grandfather because then you never would have been born to go back in time and kill your grandfather. Another slight wrinkle on this that is less of a paradox and more of an incestual scenario is that you go back in time, kill your “grandfather,” and then end up “arranging things” [rated PG blog] such that you become your own real grandfather.

That seemingly shouldn’t be “allowed” to happen, but again, since we are dealing with the universe itself, there are possible ways that the universe could have caused its own formation. For example, some ideas are that there was a previous universe that went through a “Big Crunch” and then rebound, forming our own universe. In that sense, the previous “universe” was the parent of our own “universe.” However, I’m not sure if any actual theoretical cosmologists put stock in that scenario, so I’m willing to grant that 2(b) is unlikely, but not “absurd.”

The original post then simply states that 2(c) is the only logical conclusion, that something else must have created the universe. The person then commits two HUGE logical fallacies of a non-sequitur – that that “something” that created the universe must have been God (in other words, it doesn’t necessarily follow that the something that created it was “God”) – and the fallacy of the Unstated Major Premise – that “God” actually exists.

To give you an example of why this is an “absurd” argument, think of this scenario: I come across a bird in the forest, sitting on a tree. I have never seen another animal before, nor do I know how it could have been formed, so I follow an apparent line of logic to figure out how it formed: I reason that the bird must have a cause. The cause could be the bird (a) always existed, (b) created itself, or (c) something else created it. (a) is has problems, (b) is “absurd,” and so I reason that God created it. But to you, an outside observer, you realize that I just made a major leap of literally “faith” to go from “something” created it to “God” created it … when more likely it hatched from an egg that was created by its parents and (a) G/god(s) had nothing to do with it even if (s)he/it even exists.

Other Critiques

There are other possible scientific explanations for how our universe came into being. “Brane Theory” is one, that holds that multidimensional membranes somehow interacted to create the universe. Others involve the cyclical approach I mentioned above. Another is that we represent a “pocket” of inflation from another, different, larger universe. We don’t know, but to attribute something that we don’t know to (a) divine creator(s) is yet another logical fallacy, the God of the Gaps.

Another, major, weakness of this argument is … Who/What created God? If everything must have a cause, and the idea that nothing has “always” existed, then what created God? This is a special pleading case as well as an example of the Inconsistency logical fallacy, where they’re stating that the universe can’t not have a cause, but God can.

Further Reading

Much more intelligent philosophers than I have argued about the Cosmological Argument. I invite you to read some other sources (some pro, some con):

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