Jerusalem Apostolic Church

The Antiochian Apostolic Church was the primary missionary base for Paul and Barnabas, marked by the breakthrough integration of Jewish and Gentile believers in common table fellowship and the first place where disciples were called 'Christians' (Christianoi).

The Alexandrian theological school emphasized the allegorical and spiritual interpretation of Holy Scripture, the divine transcendence of God, and the absolute unity of Christ's divine and human person in the Incarnation (Word-Flesh Christology).

The Latin and North African patristic tradition shaped Western Christian thought through its legal and juridical precision, articulating original sin, divine sovereign grace, the absolute unity of the Catholic Church, and the theological terminology of 'Trinitas' and 'una substantia, tres personae'.

Clement of Rome was an early Roman bishop who authored 1 Clement (c. 96 AD) to the church in Corinth, urging reconciliation, order, humility, and submission to duly appointed presbyters in the earliest post-apostolic witness to apostolic succession.

Polycarp was bishop of Smyrna and a direct disciple of the Apostle John. His Epistle to the Philippians and the contemporary account of his death (The Martyrdom of Polycarp) testify to his steadfast orthodoxy, opposition to Marcion, and famous martyrdom confession: 'Eighty and six years have I served Him, and He never did me any injury: how then can I blaspheme my King and my Savior?'.

Justin Martyr was a Christian philosopher and apologist who bridged biblical revelation and classical Greek philosophy, arguing in his First and Second Apologies and Dialogue with Trypho that whatever truths pagan philosophers grasped derived from the 'seed-bearing Word' (Logos spermatikos) fully incarnated in Jesus Christ.

The Oriental Orthodox Communion is an ancient communion of six autocephalous churches (Coptic, Syriac, Armenian, Ethiopian, Eritrean, and Malankara) that rejected the Council of Chalcedon (451 AD), confessing instead St. Cyril of Alexandria's formula: 'one incarnate nature of God the Word' (Miaphysitism).

The Eastern Orthodox Church is the second-largest Christian communion in the world, consisting of self-governing autocephalous patriarchates and national churches united in common faith, Byzantine liturgical life, and adherence to the Seven Ecumenical Councils, emphasizing theosis (deification), apophatic theology, and the uncreated energies of God.

The Roman Catholic Church is the largest Christian communion (over 1.3 billion members), recognizing the Pope (Bishop of Rome and Successor of Peter) as the supreme visible head and pastor of the universal Church on earth, acknowledging 21 ecumenical councils, seven sacraments, the sacrificial offering of the Eucharist, and the integration of faith and reason.