I’m going to take some time to go over some of the more basic apologetic tools that we have. This post (and a few following) will handle the answer to the question, “How do we know that God exists?” There are a number of ways to address this question; the one we’ll be looking at today is called the “cosmological argument”.

The cosmological argument, as it’s name somewhat implies, is an argument that appeals to the cosmos, or the universe. We have a pretty advanced understanding of much of science, physics, theories of gravitation, etc. We know that the universe is much bigger than our planet, and that the universe operates on what appear to be certain rules of order. Furthermore, we can generally agree that the universe as we know it seems to have had a defined beginning. Even scientists agree on this point. Big Bang theorists put the beginning about 15 or so billion years ago; creationists use a smaller number of around 6000-7000 years ago, but they all agree - the universe seems to have had a beginning.

Now….why is this important?

An important question in philosophy deals with the concept of causality. Something that has a beginning came into being because of a cause of some sort. For example, if you have a tree house, that came into being because somebody thought it would be nice to have a tree house. They then probably bought the boards, nailed them together, built a ladder, etc. Or if your favorite antique vase is on the kitchen floor shattered into a billion tiny pieces, it means it got knocked off the counter. We may not know what the cause is, but it’s broken. Nobody in their right mind would suggest that the treehouse sprang into existence without any help, or that the vase fell and broke independent of any outside force. It’s something we know instinctively - things have causes.

This concept finds expression in a key law of physics - the law of inertia. The law of inertia simply states that things stay the same unless acted upon by some outside force. Eventually a rolling ball will stop, but only because friction acts upon it. If there were no friction, the ball could conceivably roll forever. That same ball at rest will not begin rolling unless some outside force interacts with it to make it move.

Based on the idea of causality, there must be a first cause (or possibly even first causes, but we’ll stick with one for this argument). We should then be able to trace everything that’s happened up until now back to the beginning (in theory, anyway - not in practice), and come up with that first cause. This cause must itself be uncaused, otherwise it wouldn’t be the first cause - we’d have to go at least one more step back. Some early philosophers, such as Plato, speculated that this “uncaused cause” was a being known as the Prime Mover. We as Christians would agree with this; the Prime Mover is God.

Why is the “uncaused cause” exempt from the “everything has a cause” rule? The rule states that all things have causes because they have beginnings. For instance, your vase was once whole. Now it’s broken. There is a beginning to the vase being broken. There was even a period of time when that vase didn’t exist; it hadn’t been made yet. So there’s a beginning to the vase as well. The uncaused cause must be something that does not have a beginning.

Philosophers would refer to such a thing as something that contains within itself “the power of being” or that it is “self-existent”. This is to say that the uncaused cause exists not because of something that enabled it to be, but because it just is. To the best of my knowledge, the fact that there is an uncaused cause is not seriously debatable - something, somewhere, somehow must be self-existent, or nothing would exist.

So to summarize the argument:

1) Something must be self-existent, or nothing would exist.
2) All events have causes
3) We can therefore trace everything back to the first cause
4) The first cause must be whatever it is that’s self-existent
5) Since we agree that the universe had a beginning, the universe can’t be self-existent
6) Therefore there is something or someone that caused the universe.
7) That someone is God.

I must note here that this argument deals purely with necessity and causality; it doesn’t attempt to prove that the God is the God of the Bible. That’s a secondary question to be handled with other apologetic methods and arguments. This argument simply makes the statement, “there is a God.”

There is one standard objection to this argument. People will sometimes suggest that the universe is, in actuality, self-existent. Since these people are typically somewhat scientific in their worldview, their argument usually requires that they fit the Big Bang or some other explosive cosmological event into their framework.

If you run into such a person, it can be illustrative to ask them what caused the Big Bang. Then ask them what caused that. Repeat as necessary. If they make a claim that sounds odd, ask them what proof they have. The idea here is not to beat them over the head and make them feel stupid, but to sequentially (and politely) illustrate that their beliefs are just that - beliefs. As are yours. That makes the playing field level, and means you can engage in honest debate.

As always, I’d like to hear any questions/comments/thoughts you may have. Drop me a line!