Argument from Objective Moral Obligations Let "O(x)" = x is an objective moral obligation. P1. Some moral obligations are objectively binding. For example, torturing an innocent person merely for pleasure is wrong even if an entire society approves of it. P2. Objective moral obligations are not merely descriptions of what humans happen to prefer, approve of, or socially enforce. If morality were nothing more than personal or cultural preference, then: "Wrong(x) ↔ Disapproved(x)" But that would make moral criticism of an entire society ultimately reduce to “I/we dislike what that society does.” Yet we commonly distinguish: "What is approved of ≠ What is morally right." That distinction is what makes statements such as “slavery was wrong even when societies accepted it” intelligible. P3. Therefore, at least some moral truths are objective rather than merely subjective. "∃x ObjectiveMoralTruth(x)" P4. Objective moral obligations require an adequate metaphysical grounding. A physical description of an action can tell us what someone did, but a description alone does not obviously generate the categorical obligation that they ought not have done it. "PhysicalFact(x) ↛ MoralObligation(x)" P5. A necessary, perfectly good personal foundation provides a better grounding for objective moral obligation than merely contingent human preferences or impersonal physical facts. Why? Because a personal moral source can ground both the objective standard and the authoritative obligation: moral obligations are not merely facts about what humans happen to desire. P6. Therefore, if objective moral obligations exist, a perfectly good necessary personal foundation is a strong candidate for their ultimate ground. "ObjectiveMoralObligations → NecessaryMoralGround" P7. A perfectly good necessary personal foundation is a central feature of classical theism. ∴ Classical theism provides a powerful explanation of objective moral obligation. The argument does not claim that morality alone proves every attribute of God. Rather, it provides an independent line of evidence that converges with the contingency argument: "Contingency → Necessary Foundation" "Objective Morality → Necessary Moral Ground" If both arguments point toward a necessary, non-physical, personal foundation of reality, the cumulative case for classical theism becomes stronger.

That objection changes the standard of proof rather than defeating the arguments. You're saying a proof requires premises that are literally undeniable. But that's not the same thing as deductive validity. A deductively valid argument only requires that if the premises are true, the conclusion follows necessarily: P1 ∧ P2 ∧ P3 → C Whether the premises are true is a separate question: soundness. So if you reject a premise, you haven't shown that the inference is invalid. You have to show why the premise is false. Take contingency: P1: Contingent reality exists. P2: Contingent reality requires an adequate explanation. P3: An explanation consisting entirely of contingent reality cannot ultimately explain why contingent reality exists. C: Therefore, a necessary foundation exists. C(x) → ∃e Expl(e,x) ∴ ∃F[N(F) ∧ Expl(F,U)] The Stanford Encyclopedia of Philosophy explicitly recognizes this as a contemporary form of the cosmological argument and identifies P2 and the sufficiency of contingent explanations as the major points of dispute. � Stanford Encyclopedia of Philosophy But “philosophers can reject P2” doesn't establish ¬P2. It establishes disagreement. Your alternative is essentially: ◇[contingent reality exists ∧ ¬∃ adequate explanation] In other words, ultimate brute contingency is possible. That's a legitimate philosophical position—but it's not an argument against mine until you give a reason why brute contingency is preferable to an explanatory principle. And the same applies to morality. I'm not arguing: People dislike murder → God. I'm arguing: P1: Some moral obligations are objectively binding. P2: Objective moral obligations require an adequate metaphysical ground. P3: A necessary, perfectly good personal reality provides an explanation for objective moral obligation that mere human preference does not. C: Therefore, a necessary moral ground exists. The SEP explicitly recognizes this form of moral argument: objective moral obligations → God as their explanation → God exists, while also discussing non-theistic alternatives. � Stanford Encyclopedia of Philosophy Now I'll concede something important: none of these arguments, by themselves, gives every classical divine attribute. Contingency gets us to a necessary foundation; morality addresses objective obligation; further arguments are needed for omniscience, omnipotence, simplicity, perfect goodness, etc. But that's not a weakness in the cumulative case. It's how cumulative reasoning works. Contingency → Necessary Foundation Objective Morality → Necessary Moral Ground Necessary Foundation + Moral Ground → investigate whether they are the same ultimate reality Classical theism then adds further arguments for divine simplicity and the traditional attributes. Divine simplicity itself is a well-developed classical doctrine, not something I'm secretly assuming. � Stanford Encyclopedia of Philosophy So I don't need to claim that one syllogism makes every atheist psychologically incapable of disagreement. That's not the standard I'm defending. My claim is much more precise: If the premises are true and the inference is valid, the conclusion follows. Therefore, don't tell me merely that a premise is “not self-evident.” Tell me which premise is false, why it is false, and what alternative metaphysical account explains the same facts better. That's where the actual debate begins.

That's a fair objection to the simple moral argument, but it doesn't defeat the stronger version I'm defending. I agree that: Objective morality → God doesn't follow automatically. The real question is what best explains objective moral obligations, not merely whether some alternative can be logically imagined. First, “possible alternative” and “actual explanation” aren't the same thing. I agree: ◇God explains morality ↛ God exists. But my argument isn't based on possibility alone. It's based on the existence of objective moral obligations and what would adequately ground them. Consider the alternatives you gave. 1. Human flourishing If “morally good” simply means “promotes human flourishing,” then we need to explain why flourishing is objectively good rather than merely something humans value. Flourishing → objective goodness doesn't follow without another normative premise. You can say flourishing is valuable, but then I can ask: Why ought anyone pursue it, especially when doing so conflicts with their interests? That is the difference between a description of what humans tend to value and a categorical moral obligation. 2. A Platonic Form of the Good This is a much stronger alternative because Plato's Good is explicitly intended to be objective and independent of human opinion. But notice what that gives you: an abstract normative reality. It doesn't by itself explain why a person is obligated to obey it, why moral requirements have authority over rational agents, or why there is a necessary personal source of those obligations. In fact, contemporary discussions of moral arguments explicitly recognize non-theistic moral realism as a serious alternative. The debate therefore isn't “atheists have no possible account of morality.” It's whether those accounts adequately explain the normative and authoritative character of moral obligation. � Stanford Encyclopedia of Philosophy +1 3. Brute moral laws This is logically possible, but it comes at a cost: you're saying objective moral obligations simply exist without any deeper explanation. ◇[Objective moral facts ∧ ¬Explanation] That's not a refutation of the theistic explanation. It's an alternative metaphysical stopping point. And here's the important part: contemporary philosophers explicitly debate this. The SEP discusses views that treat moral truths as brute necessary facts and notes the criticism that such facts can themselves require explanation. � Stanford Encyclopedia of Philosophy So I wouldn't claim that the moral argument by itself deductively establishes every attribute of classical God. That's too strong. Instead, I would make the cumulative case: Contingency: Why does contingent reality exist at all? → A necessary foundation. Moral normativity: Why are there objective, categorical moral obligations? → A necessary moral ground. Classical theism: What kind of necessary foundation could ground both reality and objective moral normativity? The classical theist answer is a necessary, perfectly good reality whose nature is the Good itself—not a being that invents morality arbitrarily. That last distinction matters because classical theism isn't simply saying, “God makes morality true because He says so.” Classical divine simplicity identifies God's goodness with God's very nature, which is specifically intended to address the Euthyphro problem. � Stanford Encyclopedia of Philosophy So I'll concede this much: you've shown that the moral argument isn't a standalone mathematical proof of classical theism. But you've also only established that there are competing metaethical theories. You haven't established that Platonism, brute moral facts, or flourishing actually provides an equally adequate explanation of objective, categorical moral obligation. That's the debate I'd like to have. Don't just give me another possible foundation. Give me an account of why that foundation makes moral obligations objectively true, categorically binding, and authoritative over persons. Because that's the part of morality we're actually trying to explain.

You're right about one thing: a valid argument isn't automatically sound. I agree. But you've still got to distinguish “I haven't established every premise to your satisfaction” from “the argument only establishes a possibility.” My contingency argument isn't: ◇God exists → God exists. It's: Contingent reality exists + Contingent reality requires an adequate explanation + Contingent explanations cannot ultimately explain their own contingency → A necessary foundation exists. That's not an inference from possibility to actuality. It's a deductive inference if the premises are true. The Stanford Encyclopedia of Philosophy explicitly presents contemporary contingency arguments in this form and notes that premises concerning explanation and the insufficiency of contingent explanations are the central points of dispute. � Stanford Encyclopedia of Philosophy Now, I agree that this doesn't immediately give me omniscience, omnipotence, or simplicity. But that doesn't mean those attributes are being smuggled in. It means they're conclusions that require additional arguments. In fact, classical theism has a specific philosophical account of simplicity: God isn't a composite object with independently existing parts or properties; classical theists argue that God is metaphysically simple. That's a substantive doctrine with arguments for it—not something I get to assume for free. � Stanford Encyclopedia of Philosophy The same applies to morality. I'm not claiming: Objective morality → God by definition. I'm asking which account best explains objective moral obligation. You offered Platonism, brute moral facts, and human flourishing. Those are legitimate alternatives. But “I can imagine another possible account” isn't the same as demonstrating that it adequately explains the phenomenon. Robert Adams's influential divine-command approach, for example, explicitly argues from objective moral obligations toward God as their explanation, while also addressing the Euthyphro objection by grounding obligation in a necessarily good God rather than arbitrary commands. The SEP treats this as a genuine contemporary philosophical position while also discussing its objections. � Stanford Encyclopedia of Philosophy +1 So here's where I think we're actually disagreeing: You are using “proof” to mean premises that no reasonable person could reject. I'm using philosophical proof in the sense of a valid argument whose premises are independently defensible and whose conclusion follows from them. If you want to use the first definition, then virtually every substantive metaphysical argument fails by definition, because reasonable philosophers disagree about foundational premises. But if we're doing philosophy, then disagreement isn't the end of the discussion. We examine the premises. So let's stop moving the goalposts between “the premise is controversial,” “the conclusion doesn't establish every divine attribute,” and “the conclusion is merely possible.” Those are three different objections. 1. If P2 is false, show why contingent reality can coherently be ultimately unexplained. 2. If the necessary foundation isn't God, give an account of what it is and why it has the required explanatory properties. 3. If classical attributes don't follow, identify which attribute requires a separate argument—and I'll argue for that attribute separately. That's actually how classical theism is defended: not by pretending one syllogism establishes everything, but by building a cumulative philosophical case. So no, I'm not claiming I've magically proven omniscience from contingency. I'm claiming something much more precise: if contingent reality requires an ultimate explanation, then reality cannot terminate in contingency. It requires a necessary foundation. And that's not “a possible necessary ground.” That's the conclusion of the argument. The question is whether you can defeat the premises—not whether you can point out that further arguments are required.

I think you're making my concession do more work than it actually does. Yes, I conceded that the moral argument alone doesn't establish omniscience, omnipotence, and simplicity. That's because I never claimed it did. You're treating “this argument doesn't establish everything” as though it means “the argument establishes nothing beyond possibility.” Those aren't equivalent. More importantly, you're calling my entire case a “best-explanation argument,” but my contingency argument was presented as a deductive argument: P1: A contingent being exists. P2: Every contingent being has an adequate explanation for its existence. P3: A contingent being cannot completely explain its own existence. P4: Contingent beings alone cannot constitute a complete explanation of contingent existence. C: Therefore, a necessary being exists. P1 ∧ P2 ∧ P3 ∧ P4 → ∃x N(x) That's not: God is possible → God exists. It's: If P1–P4 are true, a necessary being exists. And this isn't an invented distinction. The current Stanford Encyclopedia of Philosophy explicitly presents a deductive argument from contingency with essentially these premises and conclusion. � Stanford Encyclopedia of Philosophy So your actual objection has to be P2, P3, or P4. If you reject P2, defend the claim that contingent reality can ultimately be unexplained. If you reject P3, explain how something contingent can completely explain why it exists. If you reject P4, explain how an entire collection of contingent explanations becomes sufficient simply by adding more contingency. Saying “those premises are controversial” doesn't answer any of those questions. And your alternative explanations don't automatically defeat the argument. Platonism, brute moral facts, and human flourishing are alternatives to the moral argument's conclusion; they don't refute the contingency argument at all. In fact, contemporary work by Pruss and Rasmussen explicitly develops arguments from contingency to necessary existence while addressing objections to the principle of explanation. Rasmussen and Weaver likewise develop a two-stage argument from a Necessary Foundation toward further divine attributes. � OUP Academic +1 Now let's address your strongest point: “Even objective morality doesn't prove God.” Fine. I agree that objective morality by itself doesn't logically entail every attribute of classical theism. The SEP itself distinguishes moral arguments from other theistic arguments and discusses both deductive and best-explanation formulations. � Stanford Encyclopedia of Philosophy But that's exactly why I'm presenting multiple arguments, not pretending one syllogism does everything. Contingency → Necessary Being Moral Normativity → Necessary Moral Ground Then we investigate whether the necessary reality identified by those arguments can have the attributes of classical theism. You're asking me to establish the entire classical conception of God in a single argument, and then treating the fact that I haven't done so as evidence against the arguments I've actually given. That's not a refutation. And here's the key point: “There is another possible explanation” does not refute an explanation. ◇A and ◇B does not mean ¬A. If you want to argue that Platonism, brute moral facts, or some other metaphysical account is actually superior, then defend that account. Don't merely establish that it is conceivable. So I’ll make my position as precise as possible: I am not claiming that one syllogism magically proves every property traditionally attributed to God. I am arguing that the existence of contingent reality gives us a deductive route to a necessary foundation, and further philosophical arguments can investigate that foundation's attributes. You haven't shown that the necessary foundation doesn't exist. You haven't shown that contingent reality can coherently be its own ultimate explanation. And you haven't shown that your alternative moral foundations explain categorical moral obligation equally well. You've shown that further arguments are required. I agree. That's what the rest of the case is for. So the real question isn't whether I can put the entire classical God into one syllogism. It's whether the premises and inferences I've actually presented survive your objections. If they do, then dismissing the conclusion as merely “a possible explanation” simply doesn't follow.