Marcionism, a theological construct emerging in the 2nd century CE, is best understood as an antithetical dualism that delineates the ontological bifurcation between the Demiurge—identified with the wrathful, legalistic Yahweh of the Hebrew Bible—and the hitherto ineffable transcendent God, whose salvific agent is the Christ figure. Marcion’s exegesis of scripture necessitates an execration of the Old Testament, which he perceived as an epistemologically discordant corpus incompatible with the ethical paradigm inaugurated by Christ’s dispensation. This doctrinal framework predicates itself upon an absolute discontinuity between Judaism and Christianity, wherein the Judaic deity, circumscribed by his role as a mere cosmic architect (ποιητής), is rendered ontologically inferior to the hitherto concealed Supreme Being, who operates beyond the confines of materiality and retributive justice. Marcion’s canon—radically excising Hebraic influence—preserved a redacted version of Luke’s Gospel and ten Pauline epistles, which he interpreted through the lens of a radicalized Pauline soteriology untainted by Jewish legalism. Ecclesiastically anathematized, Marcionism incited a patristic counter-movement, compelling figures such as Tertullian and Irenaeus to systematize theological refutations. Yet, its lingering influence underscores the perennial tension between law and grace, justice and mercy, and the dichotomization of divine attributes within Christian theological discourse. Whether Marcion’s postulations represent a Gnostic deviation or an esoteric distillation of Paul’s theology remains a subject of intricate historical-theological deliberation.