Mithraic ritual as proto-Christian practice = Mithraic sacraments: communion and Sunday worship

In the Mithraeum at Santa Prisca on the Aventine Hill in Rome, fragments of a Latin inscription preserve a hymn of the cult: he who saved us by shedding the eternal blood. The verse, addressed to Mithras, has been the subject of scholarly debate for nearly a century, with some scholars arguing for direct Christian influence and others arguing for parallel development. The Mithraic sacred meal, attested across the empire in iconographic and inscriptional form, included bread, water, and wine, with the wine sometimes substituted by water in particular initiatory contexts. The meal was understood to confer participation in Mithras's saving act and to ensure the participant's eternal life. Justin Martyr, writing in Rome around 150 CE, addressed the parallel directly in his First Apology: the wicked devils have imitated this in the mysteries of Mithras, commanding the same thing to be done, for that bread and a cup of water are placed with certain incantations in the mystic rites of one who is being initiated, you either know or can learn.

The Urantia Book at 98:5.4 documents the Mithraic ritual structure in unusual detail. The adherents of this cult worshiped in caves and other secret places, chanting hymns, mumbling magic, eating the flesh of the sacrificial animals, and drinking the blood. Three times a day they worshiped, with special weekly ceremonials on the day of the sun-god and with the most elaborate observance of all on the annual festival of Mithras, December twenty-fifth. It was believed that the partaking of the sacrament ensured eternal life, the immediate passing, after death, to the bosom of Mithras, there to tarry in bliss until the judgment day. The structural elements are listed precisely: sacred meal as participation in the saving deity, weekly observance on the day of the sun-god (Sunday), elaborate annual festival on December 25, eternal-life soteriology, post-mortem destination, eschatological judgment.

Each of these elements has a clear Christian parallel. The Christian Eucharist is structurally a sacred meal in which the participant participates in the saving work of Christ. The Christian Sunday is the day of the resurrection, observed weekly. December 25 became the Christian celebration of the nativity in the fourth century. The Christian soteriological framework promises eternal life through participation in Christ, with post-mortem destination dependent on faith. The eschatological judgment is the end-of-the-age framework that pervades the New Testament. The structural overlap is so extensive that some early Christians (Justin Martyr) and many modern scholars (Richard Reitzenstein, Wilhelm Bousset, the History of Religions School) have argued for substantial Mithraic influence on early Christian sacramental practice.

Manfred Clauss's 2000 The Roman Cult of Mithras provides the contemporary academic standard for the cult's sacramental practice. Clauss documents the sacred meal, the bread-and-water (or bread-and-wine) elements, the seven-grade initiatory system (Corax/Raven, Nymphus/Bridegroom, Miles/Soldier, Leo/Lion, Perses/Persian, Heliodromos/Sun-Runner, Pater/Father), and the elaborate ritual calendar. Gary Lease's 1980 article Mithraism and Christianity examined the complex interplay between the two traditions in the second through fourth centuries CE, with each potentially influencing the other through their shared social and geographic contexts.

The structural fit with the UB account is precise on the historical content. The UB does not claim that Christian sacraments were invented by copying Mithraism. The UB claims that the Mithraic sacramental practice was running before and during the formation of Christian sacramental practice, that Christianity formed in a religious environment where the Mithraic structure was the dominant alternative, and that elements of the Mithraic vocabulary were absorbed into the Christian synthesis. Justin Martyr's testimony from 150 CE, attributing the parallel to demonic imitation, is itself acknowledgment that the Mithraic practice predated the Christian and that the parallel was real.

The strongest counterargument is that the parallels are sometimes overstated, and the actual sacramental development of Christianity has substantial roots in Jewish ritual practice (the Passover, the synagogue meal, the qiddush) that do not require Mithraic explanation. This is a fair point. The Christian sacramental practice has multiple roots, including the Jewish liturgical inheritance, the historical institution of the Last Supper by Jesus, and the cultural environment of the Roman Empire in which the practice was elaborated. Mithraic influence is one factor among several, not the sole source.

The UB account is consistent with this multi-source reading. The Christian sacraments are not Mithraic in origin; they are Jewish-historical in their primary institution (the Last Supper) and partially shaped by the surrounding Mediterranean religious environment in their elaboration. The Mithraic parallels are real, but they are partial. The Mithraic eschatological framework, the cosmic-judgment imagery, and the soteriological vocabulary contributed to the Christian synthesis without displacing the Jewish-historical core.

What the parallel implies for contemporary Christian self-understanding is significant. The Eucharist is not a Mithraic borrowing. It is the historical institution of a Jewish-rooted ritual practice elaborated within a religious environment that was running structurally similar Mithraic practices. The Sunday observance is not a Mithraic borrowing. It is the day of the resurrection observed within a calendar that was running structurally similar Mithraic and Sol Invictus observances. The structural similarity reflects the fact that both traditions are partial preservations of the underlying Salem-derived teaching, with Christianity preserving more of the underlying truth and Mithraism preserving more of the cosmic-conflict eschatological framing. For contemporary believers troubled by the parallels, the UB framework offers a way to take the historical facts seriously without requiring abandonment of the sacramental practice.