The Moral Argument: From Objective Values to God
If objective moral truths exist - if some things are genuinely right or wrong regardless of opinion - then those truths require a foundation. The Moral Argument contends that God is the best explanation for the existence of objective moral values and duties.
The Formal Argument
- P1If God does not exist, objective moral values and duties do not exist.
- P2Objective moral values and duties do exist.
- ∴Therefore, God exists.
This is a logically valid modus tollens argument. If you deny the conclusion, you must deny one of the premises. Most people find Premise 2 difficult to reject - which means the weight of the argument falls on Premise 1.
This five-minute animation from Reasonable Faith - the same series as the Kalam and fine-tuning videos in this track - presents exactly the two-premise argument above. It clarifies the crucial distinction between moral values (what is good or evil) and moral duties (what is right or wrong to do), shows why "objective" means valid whether or not anyone believes it, and presses Premise 1 with the atheist picture of reality in Richard Dawkins's own words:
"The universe we observe has precisely the properties we should expect if there is, at bottom, no design, no purpose, no evil and no good, nothing but blind, pitiless indifference." - Richard Dawkins, River Out of Eden
If that picture is accurate, the video asks, where could objective values and duties possibly come from? The sections below take up that same question in detail.
The Moral Argument · Reasonable Faith (drcraigvideos) · Watch on YouTube · reasonablefaith.org/moral
Premise 1: Why Naturalism Cannot Ground Morality
On a naturalistic worldview - one where only physical matter, energy, and natural laws exist - moral facts have no obvious home. Consider the alternatives:
Evolution?
If our moral instincts are simply products of evolution and natural selection, as a purely naturalistic view holds, then they were shaped to promote survival, not to discover what is truly right. Natural selection favors survival-promoting behavior, not morally correct behavior. On that view, we have no reason to think our moral sense reveals genuine moral facts. As philosopher Michael Ruse has candidly admitted: on a purely evolutionary account, morality is "an illusion fobbed off on us by our genes."
Social Contract?
Social contract theories ground morality in agreements among rational agents. But agreements are contingent - they could have been different. A society that agreed to permit genocide would not make genocide right. Social contracts describe what people do agree to, not what they ought to agree to.
Moral Platonism?
Some philosophers argue that moral truths exist as abstract, mind-independent facts - like mathematical truths. This is philosophically coherent, but it raises a deep problem: why would abstract moral facts have any authority over concrete beings? And how would purely physical creatures gain epistemic access to non-physical moral truths? Without a bridge between the abstract and the concrete, moral Platonism is incomplete.
In The Brothers Karamazov, Dostoevsky explores the idea that "without God, everything is permitted." This is not a claim about psychology (atheists can behave well) but about ontology: without a transcendent moral lawgiver, there is no objective standard by which any action can be called genuinely right or genuinely wrong.
Premise 2: Moral Realism
Do objective moral facts exist? Consider test cases:
- •The Holocaust was objectively evil - not merely unpopular.
- •Killing an innocent child is wrong regardless of any cultural norms.
- •Human beings have inherent dignity and rights that are not granted by governments.
If you affirm any of these, you are a moral realist. And moral realism - the existence of objective moral facts - is the majority position among professional philosophers. A 2020 PhilPapers survey found that roughly 62% of philosophers accept or lean toward moral realism.
But notice what that survey does and does not show. Most philosophers agree that objective moral facts exist. But objective moral values cannot simply float free; they must be grounded in something beyond human opinion. A philosopher who believes in objective morality but rejects God is claiming the values without the foundation, and that is exactly where Premise 1 presses.
What about someone who rejects Premise 2 altogether? That view is called moral relativism: the idea that right and wrong are only what a person or culture decides. But relativism defeats itself. The claim "there are no objective moral truths" is itself presented as an objective truth about morality. The relativist cannot state their position without undermining it.
And relativists rarely stop there. They usually go on to say that we shouldn't judge other cultures, or that it is wrong to impose our values on others. Those are moral claims, stated as if they bind everyone. The relativist ends up relying on the very kind of objective moral truth they deny.
The Euthyphro Dilemma
The oldest and most common objection to theistic ethics is the Euthyphro Dilemma (from Plato): "Is something good because God commands it, or does God command it because it is good?"
If the former, morality seems arbitrary. If the latter, morality is independent of God, making God irrelevant to ethics.
The standard theistic response takes neither horn. Morality is grounded in God's nature, not God's arbitrary will. God is essentially good - goodness is not something God decides but something God is. God's commands flow necessarily from his unchangeable character. This is known as the Modified Divine Command Theory, defended by Robert Adams and William Lane Craig.
Common Objections
"Atheists can be moral. You don't need God to be a good person."
Atheists can certainly live decent, admirable lives, and the argument does not deny this. Scripture itself says that people without God's law can "do by nature things required by the law," because its requirements are "written on their hearts" (Romans 2:14-15). That moral sense is God's gift to every person, believer or not. But being good in the full sense is another matter: "There is no one righteous, not even one" (Romans 3:10), and Jesus said, "No one is good, except God alone" (Mark 10:18). That is why no one is saved by being good. And the Moral Argument is not about moral behavior (epistemology) but about moral ontology: what grounds the existence of moral facts? An atheist can know and follow moral truths just as a person who doesn't believe in mathematics can still add correctly. The question is what makes those truths true - not who can access them.
"The existence of moral disagreement shows morality is subjective."
Disagreement does not entail subjectivity. People disagree about history, physics, and mathematics - yet we don't conclude those fields are subjective. Moral disagreement can reflect ignorance, bias, or cultural conditioning without undermining the existence of moral truth. In fact, the very act of moral disagreement presupposes that there is a right answer being sought.
- If evolution explains our moral intuitions, does that undermine their reliability? Apply the same logic to our cognitive faculties - does evolution undermine the reliability of reason itself?
- How does the Modified Divine Command Theory escape the Euthyphro Dilemma?
- Is moral Platonism a viable alternative to theistic moral realism? What are its weaknesses?
The standard theistic response to the Euthyphro Dilemma is:
The Moral Argument demonstrates that objective moral values and duties - which most people recognize and most philosophers affirm - require a transcendent ground. Naturalism, evolution, and social contracts cannot provide this ground. God's essentially good nature offers the most coherent foundation for the moral facts we all recognize.