Russ Shafer-Landau's non-naturalist realism establishes that moral facts can be sui generis and necessary without requiring divine grounding, severing the link the moral argument needs.

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Divine grounding(describing the soul's eternal connection to the divine): The idea that something is ultimately connected to or rooted in God or a higher spiritual reality.
Moral argument (for God's existence)(as an argument weakened by Shafer-Landau's theory): An argument that concludes God must exist because morality needs to be explained, and God is the only adequate explanation.
Moral facts: Facts about goodness, reasons, and obligations; normative facts about what matters.
Necessary(ontological distinction in Mulla Sadra's metaphysics): The principle, God; pure existence without essence, quality or property that undergoes change or motion
Non-naturalist realism(as Shafer-Landau's main ethical theory): The philosophical position that moral facts are real and objective, but they don't reduce to or depend on physical facts about the natural world (like brain chemistry or behavior).
Russ Shafer-Landau(as a key figure defending non-naturalist realism): A contemporary American philosopher who specializes in moral philosophy and argues that moral truths exist independently of what anyone thinks or believes.
sui generis(Used to characterize goodness if naturalistic definitions all fail.): A notion that can only be understood in its own terms — in this context, goodness can only be understood in evaluative, not empirical or naturalistic, terms.

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