Head to head
Christian Soul Theory vs Sam Harris
Christian Soul Theory and S. Harris’s Mystery of Consciousness, compared field by field from their entries in the Atlas.
At a glance
- Christian Soul Theory belongs to the Dualism family in Kuhn's Landscape of Consciousness, Sam Harris to Challenge.
- They give the same kind of answer on AI consciousness and mind uploading.
- On life after death, Christian Soul Theory says “Yes” and Sam Harris says “No”.
- On meaning and purpose, Christian Soul Theory says “Cosmic/Ultimate” and Sam Harris says “Humanistic only”.
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The claim
In brief
Christian Soul TheoryThis theory posits that the human person is composed of two fundamentally distinct substances: a wholly immaterial, substantial soul (the self) and a physical body or brain. The soul is the locus of consciousness, provides personal identity, and interacts with the body in a cause-and-effect manner.
Sam HarrisThis perspective, offered as a challenge rather than a prescriptive theory, frames consciousness as an unbridgeable mystery that cannot be solved by purely physical means. Harris argues that physical descriptions are 'mute' regarding subjective experience; the only thing attesting to sentience is consciousness itself, creating a fundamental explanatory gap. He remains pessimistic that science can dispel this mystery.
What consciousness is
Christian Soul TheoryConsciousness and the mind are grounded in the substantial, unified, wholly immaterial soul, which is the entity that has experiences and grounds personal identity.
Sam HarrisConsciousness is identified as subjectivity or sentience, which is fundamentally mysterious and unexplainable by purely physical processes.
Big questions
Can AI be conscious?Both agree
Christian Soul TheoryUnlikelyIf consciousness requires a radically separate, nonphysical substance (soul) that is divinely created or allocated, non-biological intelligences could not generate this necessary component, making AI consciousness impossible.
Sam HarrisNoIf consciousness is irreducible subjectivity missing from physical descriptions, then advanced computation (AI, which is purely physical complexity) will fail to generate genuine sentience.
Christian Soul TheoryYesThe soul is the ‘real you,’ existing independently of the body and providing the clearest mechanism for the persistence of individual consciousness post-mortem, fulfilling the core tenet of Abrahamic religions.
Sam HarrisNoAs a naturalist, Harris implicitly aligns with the view that consciousness is tied to the physical organism, meaning its termination results in permanent non-existence, despite the mystery of its nature while alive.
Could a mind be uploaded?Both agree
Christian Soul TheoryNoUploading neural patterns and pathways would only duplicate the physical basis of consciousness. Since the necessary nonphysical substance (the soul) would be absent from the duplicate, first-person mental self-preservation would be impossible.
Sam HarrisNoIf consciousness cannot be explained by purely physical processes, then duplication or uploading of the physical substrate will fail to capture or recreate the essential subjective self.
Christian Soul TheoryCosmic/UltimateAs a theological theory, it provides ultimate meaning, purpose, and value tied to divine creation, destiny, and the spiritual nature of human existence.
Sam HarrisHumanistic onlyThe mystery does not imply cosmic purpose, but Harris advocates finding personal truths through introspection, aligning with self-discovered (naturalized) spirituality and meaning.
Nature of mind
Ontology
Christian Soul TheorySubstance Dualism. Reality consists of at least two ontological categories: physical (brain/body) and nonphysical (soul).
Sam HarrisSkeptical/Mysterianism (Justified: The view asserts the philosophical intractability and unbridgeable nature of the mind-body problem, aligning with core tenets of mysterianism, though without adopting a specific alternative ontology.)
Mind and body
Christian Soul TheoryInteractionist: The immaterial soul relates to the physical body/brain in an informing and cause-effect way, meaning physical states cause phenomenal states, and phenomenal states cause physical states.
Sam HarrisUnbridgeable Gap / Non-reductive Correlation (Justified: Harris asserts that while physical processes correlate with consciousness, no analysis of these processes can logically yield a picture of consciousness, leaving an unbridgeable gap.)
Fundamental or emergent
Christian Soul TheoryPrimitive. The soul is a substantial, nonphysical substance, often held to be created and allocated by God (Creationism) rather than arising from material processes.
Sam HarrisMystery (Justified: Harris declines to fully endorse emergence, stating that while consciousness may be the lawful product of unconscious processing, he does not find that sentence meaningful in explaining sentience.)
Qualia
Christian Soul TheoryQualia (qualitative feel) are phenomenal properties borne by the immaterial soul, which provides the single, unitary awareness of complex experiences.
Sam HarrisQualia (what it is 'like something' to be) are the phenomenon that physical events are 'mute' about, thus creating the unbridgeable mystery.
How it works
Mechanism
Christian Soul TheoryInteractionism, which requires that the physical world is not causally closed, allowing the nonphysical soul to exert causal power over the physical brain and vice versa.
Sam HarrisNone (Justified: The core premise is the failure of all current and foreseeable physical/mechanistic principles to explain subjectivity.)
Where it is
Christian Soul TheoryThe non-extended soul is associated with the body, being fully 'present' at each point within it.
Sam HarrisUnknown/Mysterious (Justified: While consciousness correlates with the brain, the theory explicitly rejects confining the explanation of consciousness to physical location or distribution because the physical world yields no evidence of consciousness.)
What it does
Christian Soul TheoryThe soul's main functional role is providing causal efficacy for mental states (especially in relation to libertarian free will) and grounding personal identity. It also gives form to and animates the body.
Sam HarrisUnknown/Irreducible (Justified: Causal power is not explained by unconscious complexity. The presence of sentience is an ultimate mystery rather than a functional adaptation that can be described reductively.)
Evidence and criticism
Testability
Christian Soul TheorySpeculative/Philosophical. Direct empirical testing is impossible due to the soul’s nonphysical nature. It is argued that empirical evidence for survival beyond death (like NDEs/OBEs) would instantaneously falsify materialism and support dualism.
Sam HarrisConceptually Untestable (Justified: If the gap is unbridgeable, as Harris claims, the mystery cannot be dispelled by empirical science as currently practiced.)
Tests so far
Christian Soul TheoryReported observations such as near-death experiences (NDEs) and out-of-body experiences (OBEs) are cited by adherents as phenomena requiring a nonphysical explanation, which the soul provides.
Sam HarrisNone (Justified: The framework is a diagnosis of science's failure to address the hard problem and does not propose empirical tests for the mystery itself.)
Criticisms
Christian Soul TheoryThe primary tension is the problem of mental causation (how an immaterial soul can causally interact with the physical body/brain) and the conflict with the widely accepted scientific principle of the causal closure of the physical world. Critics often attribute persistence in this view to 'folk myths' or persistent traditions.
Sam HarrisIt functions primarily as a critique against reductionism and scientific optimism regarding consciousness, classifying the issue as an ultimate mystery, which reductionists reject as pessimism (mysterianism).
Sources
Key sources
Christian Soul Theory
- The Substance of Consciousness: A Comprehensive Defense of Contemporary Substance Dualism (2023)
- The Soul: How We Know It’s Real and Why it Matters, J.P. Moreland (2014)
- Mind, Brain, and Free Will, Richard Swinburne (2013)
Sam Harris
- The mystery of consciousness (Part I & II), Sam Harris (2011)
- Explorations in Consciousness: Death Psychedelics and Mystical Experience (2023)