Two churches stand in the same postcode. The stone one seats eight hundred, was full for a century, and now scatters forty people across its pews on a good Sunday. The warehouse one has a car park, a sound desk, and a queue. Whatever is happening to God in that city, it is not happening evenly, and the unevenness has a mechanical explanation.
One caution before the mechanics. This essay reads plumbing, not truth. Nothing below is an argument for or against any doctrine; a supply analysis of a faith no more settles its claims than a study of aqueducts settles the quality of the water. What the analysis does settle is where the water will and will not reach.
The Network
The System supplies the frame. A belief is a standing pattern in a current; it holds only while fed; its food is manas, signals received and interpreted; and an identity holds only if its beliefs hold, so the demand never rests. A religion, from this angle, is a supply network at civilisational scale: a coordinated architecture for delivering manas to millions of believers across generations. Networks differ in what they promise, but they differ more consequentially in where the supply comes from, and three source classes cover the field. The archive supplies manas from the past: it happened, the record shows it, therefore. The live current supplies manas from present experience: it is happening, in this room, to me. The collective field supplies manas from other believers: everyone I know holds this up. Every faith runs a blend of the three. The blend is the architecture, and the architecture decides what can starve it.
The Curated Field
For roughly a millennium, Western Christianity ran the largest curated feedback field ever constructed. The calendar, the parish, the guild, the school, the court, and the deathbed all delivered the same manas; dissent was restricted at the source; and the collective field was so dense that the archive rarely took weight, because a claim held up by everyone a receiver has ever met requires no documents. Inside a field like that, supply meets demand continuously, the deficiency gauge reads zero, and the system presents as complete. Whether the fullness was satisfaction or stagnation stayed untestable, because the test requires an uncurated field, and there was none within reach.
The De-curation
Print cracked the field; scholarship and science de-curated it. Strauss's Life of Jesus (1835) subjected the archive to historical criticism, Darwin (1859) removed the design argument's monopoly, and each following decade shifted more of the network's weight onto its most fragile source class at exactly the moment that class came under professional audit. Claims of literal miracle and bodily resurrection are archive-supply: manas minted from historical assertions, and historical assertions are the one commodity the modern verification field taxes without mercy. For receivers exposed to that field, the confirming manas thinned, the tax arrived as the discomfort every educated believer of the nineteenth century wrote about, and the deficiency became chronic. Secularisation, mapped across populations, tracks exposure to the de-curated field more closely than it tracks wealth, politics, or any rival variable a supply analysis would ignore. The honest caveat belongs here: secularisation has many causes, and this essay claims one mechanism, not a monopoly. The mechanism earns its place by what it predicts next.
The Controlled Experiment
Christianity then ran the experiment on itself, in two arms, and the arms sorted by supply strategy. The mainline arm attempted repair by subtraction. Demythologising, given its programme in Bultmann's 1941 lecture, retired the miracle-manas as untenable and offered the existential reading in their place: an interpretation, not a supply. The Lab's ordering doctrine names the error exactly: abandon before replacing the good and the subtraction collapses you. The mainline denominations retired their supply lines without sourcing new ones, and the emptying stone church of the opening paragraph is what a hermit-belief looks like at institutional scale.
The other arm never touched the archive. Pentecostalism, datable to Azusa Street (1906), relocated the network's weight onto the live current: healing, tongues, prophecy, deliverance, ecstatic worship, manas minted in the room, in the present tense, in the receiver's own nervous system. A historian cannot tax an experience the believer had on Tuesday. The result is the fastest-growing religious movement on earth, overwhelmingly in the Global South, and the growth map is the supply map: the arm fed from the archive declines where the archive is audited, and the arm fed from the live current grows wherever there are rooms. One religion, two supply architectures, and the deficiency law called both outcomes.
The Altitude of the Anchor
The architecture-side of the analysis appears elsewhere in this work. The Unbroken Chain examines a system whose highest signifier has a form and yet has no form, and finds it unattackable by evidence for the same reason it is unrepresentable by statues. A network anchored to a datable event in a specific tomb enjoys the opposite condition, and its own chief engineer said so in writing: if Christ has not been raised, our faith is in vain. Paul named the single point of failure in the founding documents, and the network spent eighteen centuries protected from the consequences by field curation rather than by the anchor's strength. When the field opened, the anchor took the load. Everything since has been load redistribution.
Reading Forward
A working supply analysis runs history forward, which is what makes it science rather than commentary. The predictions fall out mechanically. Movements fed from audited archives will keep declining among the audit-exposed and hold among the sheltered, so their institutions will drift toward shelter-building, parallel schools and parallel media, the curated field rebuilt at whatever scale can be defended. Movements fed from the live current will keep growing and keep fragmenting, because experiential supply certifies no central authority. The collective field remains decisive everywhere, which is why every rising and falling faith invests first in gathering. And the analysis is not confined to religion. Political movements, wellness cultures, and national identities run the same three source classes, and their maps will sort the same way. Read where the manas come from. The rest is arithmetic.