Biblical Justification for Classical Arguments

Since I am Reformed, I have often been criticised for my use of classical apologetics such as Cosmological Arguments on the basis that it has an unbiblical anthropology. The presuppositionalist claims that we shouldn’t grant the ground to the atheist that they can use reason, since reason is grounded in God and depends on God. Under their worldview, there is no God, so there is no justification for why they can use reason.

Further, claims the presuppositionalist, by doing this we allow man to sit in judgement over God. Man gets to weigh the evidence, and then use their reason (for which they depend on God) to judge whether God is God or not, whether God exists or not. But in reality, God is the judge, and we have no authority over Him.

I think there is some merit to this, but I do not think this disqualifies classical arguments. And indeed, I think there is biblical precedent for these arguments and a place for them in apologetic practice.

First and most obviously, we appeal to Romans 1. Here is the section I have in mind (please read the context yourself):

18 For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men who suppress the truth in unrighteousness,19 because that which is known about God is evident within them; for God made it evident to them. 20 For since the creation of the world His invisible attributes, His eternal power and divine nature, have been clearly seen, being understood through what has been made, so that they are without excuse. 21 For even though they knew God, they did not honor Him as God or give thanks, but they became futile in their speculations, and their foolish heart was darkened. 22 Professing to be wise, they became fools, 23 and exchanged the glory of the incorruptible God for an image in the form of corruptible man and of birds and four-footed animals and crawling creatures.

24 Therefore God gave them over in the lusts of their hearts to impurity, so that their bodies would be dishonored among them. 25 For they exchanged the truth of God for a lie, and worshiped and served the creature rather than the Creator, who is blessed forever. Amen.

Why are men without excuse? Because knowledge of God was freely available to them: His eternal power and divine nature are displayed in creation. But they did not approve of having God in their knowledge, so they suppress the truth and their foolish hearts were darkened.

This affirms what cosmological arguments claim: that we can look at the world, and reason about it, and deduce that there is a God. This also applies to fine-tuning arguments. Paul affirms that this kind of reasoning (though not individual arguments, just the kind of reasoning) is valid, and in fact, people are morally guilty for failing to accept the conclusions of this kind of reasoning.

Now the presuppositionalist claims that yes, this is the case. But their foolish hearts were darkened, and they cannot see this any longer, as they suppress the truth in unrighteousness. The only thing that can undarken their hearts is God regenerating them, the hearing of the Gospel, and faith in God.

I agree. And I think that no apologetic encounter is complete without the Gospel, and in fact, the proclamation of the Gospel must always be central. Don’t get me wrong, if you walk up to someone, run them through the LCA, and leave, you’ve done them basically no good.

But I don’t think that means that cosmological arguments do no good. Part of the proclamation of the Gospel is that there is a God, there is a Designer and a Judge, and we have failed to live up to His standards. And if we must justify that claim, we will, and we will use cosmological arguments as part of that justification.

And of course, no-one will listen unless God regenerates their heart. But if God does regenerate their heart, as is His prerogative, then cosmological arguments which demonstrate to their mind the truth of God can be an effective part of Gospel witness. And if He doesn’t, then they expose inconsistency. More on that later.

The second main point I want to make is this. The presuppositionalist says that the atheist has no ground for using reason without appealing to God, no reason to believe that reason is reliable apart from God. I want to point out that that is precisely the same way cosmological arguments proceed, but in reverse. The presuppositionalist claims “Reason is reliable only if God exists”, and the classical apologist claims “If reason is reliable, God exists”. These two statements are logically equivalent. For we assume reason and conclude God, so reason entails God. And so when the atheist says they can use reason but have no God, then if the classical arguments are sound, we can say that they are inconsistent.

And notice that no matter which path we take, classical or presuppositional, we must appeal to reason at some point. If we do present a convincing argument that reason is grounded in God, the atheist must use reason to accept the argument. We both assume they are able to reason, even if they don’t have a sufficient ground for it.

Now it is true that discussions cosmological arguments can often get lost in what we might call meaningless minutia, and we lose our focus on God. But I submit that not only is this true for any kind of argument, but also that it isn’t a huge problem. While every conversation we have must have Christ at the centre, not every sentence needs to. Clearly, in negative apologetics, we know this, when we respond to a supposed contradiction in the Old Testament we normally don’t talk much about Christ in that particular subpoint.<

We also see from Paul at Mars Hill that it is valid to in a sense “enter into” someone else’s worldview in order to preach the Gospel. Paul begins his evangelistic and apologetic work at Mars Hill by appealing to a god the Athenians worshipped, the unknown God. He identifies this god with God, claiming that this God created the universe and everything in it. He then quotes parts of some works describing Zeus and attributes them to God. Paul enters into their worldview to make a point, to demonstrate the truth of God inside their worldview. Because of course, we know that any worldview without God is inconsistent. So if we enter their worldview and pretend that it is consistent, we ought to be able to prove God exists. This is what cosmological arguments do: let’s enter into the atheistic worldview, pretend that we can reason, and deduce that God exists.

But as we saw above, the dark-hearted fools who are unregenerate won’t accept it. More often than not, they admit they have no response to the argument, but retreat to “Well sure maybe God exists. But if He does, He is a moral monster and is evil and I would never worship Him.” And this is the appropriate place to quote Romans 9: “And who are you, O man, to answer back to God?”. We affirm, like our concerned presuppositionalist does above, that God is the judge and we are not. We point out their pride and wrong-headedness in sitting in judgement over God.

They pretend their disagreement with God is intellectual, not moral. But we know from our study of Romans 1 that it is indeed moral. Cut away their intellectual pretence, and they are forced to admit the truth. This is where we cut to the heart: man placing Himself above God. And if God grants them a regenerated heart to see this and repent, then they can turn and be saved.

This is why I think cosmological arguments, and other classical arguments, are valuable. Never do they comprise the entirety of our apologetic preaching or methodology, but they are valuable components. Paul affirms their soundness in Romans and applies a similar methodology (to Pagans rather than atheists) at Mars Hill. Not the only valuable arguments, but good ones to have in our bag when the need arises.

A Bad Response to the Problem of Evil

In thinking about the post yesterday I remembered a particularly bad response to the problem of evil that I often see Christians deploy. The atheist claims that if evil exists, then the God of Christianity cannot. And the Christian responds by saying something like “As an atheist, you can’t even know what evil is, since you need God in order for moral facts to be true. So without God, there’s no evil. And since you do not believe in God, you cannot believe in evil, so you cannot formulate a problem of evil.”

I think that this is a very poor response, because I think it misunderstands what the problem of evil accomplishes. It is a reductio ad absurdum argument.

If this is a new term for you, then I will give you another example of such an argument. Here we will prove that there is no largest integer. We will do this by first assuming that there is such an integer.

  1. Suppose N is the largest integer
  2. For all integers K, K+1 is larger than K
  3. Therefore N+1 is larger than N
  4. Therefore N is not the largest integer
  5. Therefore there is no largest integer


Now, do I have to believe that there is a largest integer in order to make this argument? Premise 1 says that there is a largest integer, so surely I believe that. But obviously I do not. Similarly, the atheist makes an argument like this:

  1. Suppose God exists
  2. Since God exists, suppose that evil exists
  3. Therefore God does not exist.


Does the atheist have to believe premises 1 and 2 for the argument to work? No, of course not. The argument is essentially the atheist deliberately taking on the Christian assumptions, like God and evil (and they might even take our definition of evil) in order to show that these assumptions are false, just like premise 1 “N is the largest integer” is false.

So even if the atheist doesn’t know what evil is, even if the atheist is a moral antirealist who claims that there is no good and evil, they can still validly use this argument. Now obviously I think the argument fails, for reasons I gave yesterday, but the objection in question here is not a good one.

Some Christians think that this objection is the one given by God in Job. The Christian reads God’s monologue at the end of Job and hears God saying “Who are you to question me, I am the Lord, I know good and evil, I have the right to do whatever I want. You do not sit in judgment over me, I sit in judgement over you.”

And that’s right, that is what God is saying. But the right interpretation is not that we have no conception of evil by which we can argue. The right interpretation is that we are too small to understand God’s reasons for doing what He does. And certainly far too small to claim that God has no such reasons. I think the response given to us by God in Job is not the argument “You can’t talk about evil if you don’t know what God is”, I think it is “You don’t know all the reasons I have for what I do”. So in other words, I think God’s response is best charactarized by the use of higher order goods, which might be mysterious to us, in order to explain lower order evils. God does have reasons.

But there is another problem here I think. I agree that the atheist does not have a full grounding for evil, since as I’ve said before, moral facts (and all other kinds of facts) are grounded in God. And I do agree that the naturalist, materialist, physicalist worldview is less well equipped to ground moral facts than a theistic worldview. But put aside for the moment the fact that the atheist doesn’t need to believe in evil to use the problem of evil. But I think in general, atheists do indeed know what is good and what is evil.

Consider Romans 2: Paul claims that the gentiles, those who do not believe in God, know what is good and evil because their conscience testisifes to them. And Paul uses this as an argument that the gentiles are guilty of sin: their conscience told them what is right and what is wrong, and they knowingly did what is wrong. Atheists are not without a God-given conscience, so we are not unjustified in saying that atheists in general do know what is good and what is evil. Not as well as the believer perhaps, and they might not know why certain things are good or evil. But most of them not only believe that evil exists, they are usually right about what evil is. They don’t have God to ground it, but it’s not clear why grounding is necessary for them to deploy a problem of evil argument.

So while I do think the problem of evil argument fails, I think “The atheist doesn’t know what evil is because they don’t believe in God” is quite a bad objection to it.