Catholicism

L'Église catholique romaine est la plus grande dénomination chrétienne (1,4 milliard de fidèles). Elle se comprend comme l'Église fondée par le Christ sur les apôtres, en continuité ininterrompue depuis Pierre.

Le Magistère et l'autorité doctrinale

Le Magistère est l'autorité d'enseignement exercée par les évêques en communion avec le pape. Ordinaire (habituel) et extraordinaire (ex cathedra — infaillible). Deux définitions ex cathedra : Immaculée Conception (1854) et Assomption (1950). La co-normativité de l'Écriture et de la Tradition est définie à Trente (Session IV, 1546) et réaffirmée par Vatican II (Dei Verbum).

Vatican II (1962–1965)

Quatre constitutions : Sacrosanctum Concilium (liturgie), Lumen Gentium (Église), Dei Verbum (Révélation), Gaudium et Spes (Église et monde).

The Four Marian Dogmas

The Roman Catholic Church has formally defined four Marian dogmas. Two derive from ancient Christology (Theotokos, perpetual virginity) and are shared in varying degrees by Orthodoxy. Two others were promulgated ex cathedra by the Roman magisterium alone (Immaculate Conception 1854, Assumption 1950) and are not received by Orthodox or Protestants.

Theotokos (Ephesus, 431)

The Council of Ephesus in 431 (3rd ecumenical council) condemned Nestorius and defined Mary as Θεοτόκος (Theotokos, "God-bearer," or more literally "she who gave birth to God"). This is a Christological definition: Jesus is one divine person in two natures, so Mary gave birth to the divine person. Received by all churches descended from the council (Catholics, Orthodox, Anglicans, Lutherans; not received by Nestorian churches).

Perpetual Virginity of Mary

Affirmed from the Fathers (Origen, Athanasius, Cyril of Jerusalem) and received by the councils of Ephesus (431) and Constantinople II (553). The Lateran Council of 649 affirmed the formula ante partum, in partu, post partum ("before, during, and after birth"). Position shared by Orthodox, classical Lutherans (Luther himself), and some Anglicans. Modern evangelical Protestants mostly reject post-partum virginity, citing Mt 13:55-56 ("brothers and sisters of Jesus").

Immaculate Conception (1854)

Defined by Pius IX on December 8, 1854, in the bull Ineffabilis Deus: Mary was conceived, from the first instant of her existence, preserved free from all stain of original sin. Long debated in the Middle Ages (Thomas Aquinas rejected it; Duns Scotus defended it with the notion of praeredemptio, "preventive redemption"). Rejected by Orthodox (who instead affirm Mary's "absence of actual sin") and by Protestants.

Assumption (1950)

Defined by Pius XII on November 1, 1950, in the apostolic constitution Munificentissimus Deus: at the end of her earthly life, Mary was taken up body and soul into heavenly glory. The dogma remains carefully indeterminate on the question of an actual death of Mary (left open: expleto terrestris vitae cursu, "the course of her earthly life completed"). The Orthodox celebrate the Dormition (Koimēsis) of the Theotokos on August 15 — parallel liturgical feast but without a formally defined dogma. Protestants reject this dogma as lacking biblical foundation.

Papal Infallibility (Vatican I, 1870)

Definition of Pastor Aeternus

On July 18, 1870, at its fourth session, the First Vatican Council defined in the dogmatic constitution Pastor Aeternus (ch. 4) the infallibility of the pope when he speaks ex cathedra. The text specifies strict conditions: (1) speaking as pastor and teacher of all Christians, (2) by virtue of his supreme apostolic authority, (3) defining a doctrine concerning faith or morals, (4) to be held by the universal Church.

Pastor Aeternus — text

Cases of ex cathedra exercise

• Immaculate Conception (Pius IX, 1854) — bull Ineffabilis Deus.
• Assumption (Pius XII, 1950) — constitution Munificentissimus Deus.

Position of other churches

The Orthodox accept neither universal jurisdictional primacy nor personal papal infallibility; for them, infallibility resides in the whole Church as expressed in ecumenical councils received by the Christian people. The Old Catholics precisely separated from Rome in 1871 in reaction to Vatican I (Declaration of Utrecht 1889). Protestants reject all human infallibility, grounding doctrinal authority in sola Scriptura.

Vatican II — Major Constitutions

The Second Vatican Council (1962–1965), convoked by John XXIII and completed by Paul VI, produced four constitutions, nine decrees, and three declarations. The four constitutions are the major dogmatic texts.

The ecclesiological turn of Lumen Gentium

The constitution Lumen Gentium takes a major turn by speaking of the Church as populus Dei ("people of God," ch. II) before mentioning the hierarchy (ch. III). The text also affirms that the Church of Christ subsistit in ("subsists in") the Roman Catholic Church (LG 8) — a formula deliberately less exclusive than the older est ("is") which simply identified the Church of Christ with the Catholic Church. This nuance opens the way to ecumenical dialogue.

Lumen Gentium 8 — text

Purgatory

Tridentine definition

The Council of Trent, in its decree on purgatory (25th session, December 4, 1563), affirmed the existence of purgatory as a post-mortem state where the souls of the faithful who died in grace but imperfectly purified complete their purification before entering beatitude. Trent confirmed the practice of Masses for the dead and the value of indulgences, while warning against abuses.

Scriptural foundations cited

• 2 Maccabees 12:43-45 — expiatory sacrifice of Judas Maccabeus for the dead soldiers. Deuterocanonical text not received by Protestants, who thereby reject the argument.
• 1 Corinthians 3:13-15 — work tested by fire: "they will be saved, but only as through fire."
• Matthew 12:32 — sin that "will not be forgiven either in this age or in the age to come" — interpreted as suggesting possible post-mortem forgiveness.

Position of other churches

Protestants unanimously reject purgatory (Augsburg Confession XXIV, 39 Articles XXII, Second Helvetic Confession XXVI). Critiques: lack of scriptural foundation in the Hebrew canon, contradiction with free justification, financial drift of indulgences. The Orthodox reject the Latin notion of purgatory as a defined intermediate state; they nevertheless admit possible post-mortem purification and pray for the dead. The Councils of Lyon II (1274) and Florence (1439) attempted in vain to make the Greeks accept the Latin doctrine; each Church then withdrew its consent.

Pedagogical synthesis

Roman Catholicism is structured around three major axes explored in this module:

• Magisterial authority articulated around the papacy and council (Vatican I 1870, Vatican II 1962–1965);
• Dogmatic Mariology, which distinguishes Roman Catholicism from all other Christian traditions by its two ex cathedra dogmas (Immaculate Conception, Assumption);
• The sacraments and the doctrine of salvation which culminate in the Eucharist (transubstantiation) and purgatory — topics treated in the dedicated modules Sacrements, Soteriology, and Eschatology.

For comparison with other traditions, see the modules Orthodoxy, Protestant Branches, and the comparative modules Comparative Ecclesiology, Comparative Soteriologies, and Comparative Sacraments.