By: Hendrik van der Breggen

For some people, the relationship between faith and reason is like oil and water—they don’t mix. On this view, religious beliefs cannot and should not be subject to rational evaluation.

I disagree with this view.

To defend my disagreement, I will look at some objections to the use of reason when it comes to matters having to do with God, then I will set out some replies.

Objections to the use of reason

Objection 1. At the core of a religious belief system are some fundamental assumptions about the world, and these cannot be tested by reason.

Objection 2. Rational inquiry is open ended: on an ongoing basis we need to consider newly turned up bits of relevant evidence, so a proof is never had, and so a reason-based decision about God must be put off indefinitely—hence reason is of no help.

Objection 3. When it comes to God, we must make a leap of faith. Faith involves risk and commitment, and faith is purely subjective—these are different from reason.

Objection 4. God is “wholly other” (utterly transcendent) and thus beyond the capacity of reason to grasp.

Objection 5. Using reason makes reason one’s God, placing reason above God—and thereby one commits idolatry.

Replies to objections (order of replies corresponds with order of objections)

Reply 1. Yes, religious belief involves fundamental assumptions about what is religiously the case (i.e., what is ultimately real and how one ought to live). But life itself also presents us with some fundamental assumptions that have to do with knowledge (a.k.a. fundamental epistemological assumptions).

Here is a list of fundamental epistemological assumptions: that there is a world; that the world is older than five minutes; that my everyday perceptions of the world are veridical (e.g., simple seeing); that with careful investigation we can know some further truths about the world (non-exhaustively and fallibly); that some logical principles are universally valid (e.g., the principle of non-contradiction, modus ponens, modus tollens, disjunctive syllogism, etc.); that inductive reasoning is legitimate (e.g., empirical enumeration, inference to best explanation, argument by analogy); that whatever begins to exist has a cause (i.e., out of nothing, nothing comes); that some moral propositions are universally true and known to be true, though suppressed by some bad folks (e.g., that torture for fun is morally wrong, that people have intrinsic worth).

Significantly, whether one is religious or not, because these fundamental epistemological assumptions seem very much to be true, it follows that the fundamental assumptions at the core of a religious system might be tested indirectly against the known reality of the world.

To test a religious system, we can ask: If the core religious assumptions are true, what are the logical implications, that is, what should we expect in the world? Then we can look at the world to see if those implications/ expectations are satisfied/ confirmed.

Consider some core doctrines of Christianity (a.k.a. “mere Christianity”). If true, we should expect the following: that the world is real (not illusory); that the universe began a finite time ago (it’s not eternal); that the universe is rational and generally law-abiding (i.e., the universe is a cosmos, not a chaos); that humans can know the world via investigation (albeit fallibly and non-exhaustively); that there is real moral value (e.g., the creation itself has value, but human beings especially have real intrinsic worth); that we have free will (we are not material robots); that Jesus actually lived, died, and resurrected (in history). Confirmation of these expectations would count in favour of the view that’s under investigation, whereas disconfirmation would count against the view.

Reply 2. Yes, rational inquiry is open ended and so on an ongoing basis we should be open to newly turned up bits of relevant evidence—whether negatively or positively relevant—and, yes, an absolute “proof” is never had. However, it does not follow logically that we cannot make a decision about God. Indeed, a preponderance of evidence may make a decision in favour of belief and trust in God very reasonable. (Also, proofs are not the only basis for reasonable belief: there are also cumulative case arguments and inferences to best explanation.)

Reply 3. Yes, there is a leap of faith. However, it is surely better to make a leap of faith in the direction that the evidence points than not. Think of the religious group called Heaven’s Gate. The people of this group placed their faith in a man who told them that there was a space craft behind a comet and that to board the space craft required suicide. Surely, because of the lack of good grounds in reality for these doctrines, such a leap of faith is silly. Now, if there are good grounds in reality for thinking, for examples, that the universe points to God’s existence, that Jesus’ bodily resurrection occurred, and that He claimed to be God, then trusting Him is not silly.

To be sure, faith involves risk and commitment and subjectivity, but faith also involves intellectual content about an object: faith is a trust in something or in someone. Faith involves belief, trust, volition—and an object. In the case of the Christian faith, it is alleged that the object can be intellectually discerned and confirmed via reason (reason coupled with a humble heart that wills to serve God if God exists).

Reply 4. Whether God is “wholly other,” i.e., utterly transcendent, and therefore beyond the human capacity for understanding, may be true or it may be false—we have to check it out. The Christian view holds that God is knowable by humans (though not exhaustively so) because God reveals Himself in creation, in Scripture, in Christ. This, if true, can be checked out with the careful use of reason.

Reply 5. Philosopher Michael Peterson (et al.) addresses the point about idolatry as follows: “To the charge that testing one’s faith by logic is placing logic above God, the retort might be that a really strong and sound faith involves the confidence that one’s beliefs can pass any properly conducted test on the basis of logic and evidence.” In other words, if such a faith passes, then logic and evidence are not above God; rather, logic and evidence would be servants of God.

Peterson adds: “Can’t we, in fact, go even further than this, and say that in order to be taken seriously by a reasonable person a religious belief-system must be subjected to the tests of logical consistency and factual correctness?” If not, then why bother with the religious belief-system?

Faith and reason don’t mix? Surely they do. Moreover, in view of the competing, contradictory claims of various religions and philosophies, they should.

Postscripts (concluding and unscientific, but reasonable)

The use of reason in thinking about God doesn’t preclude mystical/subjective experience of God. However, I submit that if a mystically or subjectively experienced spirit doesn’t testify that Jesus is the God described in the Bible who has come to earth as a human being—and who was killed by crucifixion and subsequently bodily resurrected—then that spirit isn’t from God. Of course, I could be mistaken. Nevertheless, this is what my reason tells me as I try to love God with my mind (intellect) as well as my heart (will and emotion).

I am glad that we live in a society that allows us the freedom to figure these things out for ourselves. I am glad, too, that we can engage in respectful public discourse about these topics — thanks Political Animal Magazine.


The above quotes and several of the above insights are from Michael Peterson, William Hasker, Bruce Reichenbach, and David Basinger’s Reason and Religious Belief: An Introduction to the Philosophy of Religion, 4th edition (New York and Oxford: Oxford University Press, 2009), 58-61.

Recommended readings

● William Lane Craig, Reasonable Faith, 3rd edition (Wheaton, Illinois: Crossway Books, 2008).
● William Lane Craig, On Guard (Colorado Springs, Colorado: David C. Cook, 2010).
● Nabeel Qureshi, Seeking Allah, Finding Jesus (Grand Rapids, Michigan: Zondervan, 2014).
● Lee Strobel, The Case for Miracles (Grand Rapids, Michigan: Zondervan, 2018).

Hendrik van der Breggen, PhD, is associate professor of philosophy at Providence University College, Otterburne, Manitoba, Canada. Hendrik’s teaching and research interests include philosophy of religion, philosophy of science, critical thinking/ logic, and ethics. Over the past nine years, Hendrik has written (and continues to write) the newspaper column “Apologia” in which he attempts to make philosophy accessible to the general reader. Past and current installments of “Apologia” are available at Hendrik’s blog. Links to Hendrik’s other articles can be found at his faculty profile page. The views expressed here or in his column/blog do not always reflect the views of Providence.

Image: The Incredulity of Saint Thomas, Caravaggio