Reasoning steps: One holy catholic and apostolic Church

Verdicts: F16 · One holy catholic and apostolic Church. Method: conventions, scoring and proximity eras. Scripture is the primary measure; fathers are weighed by era (Era I to c. 150 = 1.0, II = 0.8, III = 0.6, IV = 0.4).

F16.1: One holy catholic and apostolic Church

Step F16.1.1: Scripture

Eph 4:4 (‘one body and one Spirit’); Eph 2:20 (built on the apostles and prophets); Eph 5:25–27 (Christ’s holy bride); 1 Tim 3:15 (pillar and buttress of the truth); Matt 16:18.

Step F16.1.2: Patristic evidence

Ignatius (Era I): ‘wherever Jesus Christ is, there is the Catholic Church’. Cyprian (Era III): ‘He can no longer have God for his Father, who has not the Church for his mother’. The 381 creed confesses one, holy, catholic, apostolic Church. Sources: ignatius-f16-s1 · cyprian-f16-s1 · constantinople-i-f16-s1.

Step F16.1.3: Weighing decision

All fathers confess one Church; Cyprian identifies it with the visible episcopal communion. Later Protestant confessions confess the same Church but distinguish the invisible elect from the visible church. Both readings confess F16; the visible/invisible distinction is the second-order difference. Verdict: consensus on the confession; split on its institutional sense.

• Confidence: High (confession); medium (institutional sense).

Step F16.1.4: Source-proximity weighing

• Scripture (benchmark): There is one body of Christ, holy and built on the apostles (Eph 2; 4; 5). Scripture uses ἐκκλησία both for local congregations and for the whole people of God. (Scripture confidence: high)
• Assessment: Scripture and Era I support the confession. Cyprian’s strict visible identification is Era III.

Post-750 development by tradition

Catholic

See the F16.1 note.

• F16.1 (fathers 4/4; Scripture 4/4): Creed; Vatican I/Trent identify it with the Roman communion.

Orthodox

See the F16.1 note.

• F16.1 (fathers 4/4; Scripture 4/4): Creed; the Orthodox communion as the one Church.

Oriental Orthodox

See the F16.1 note.

• F16.1 (fathers 4/4; Scripture 4/4): Armenian creed: ‘only one, catholic, and apostolic, Holy Church’ (verified).

Lutheran

See the F16.1 note.

• F16.1 (fathers 3/4; Scripture 4/4): AC VII: ‘one holy Church is to continue forever’, the congregation of saints where the gospel is rightly taught.

Anglican

See the F16.1 note.

• F16.1 (fathers 4/4; Scripture 4/4): Art. XIX: ‘The visible Church of Christ is a congregation of faithful men’; Nicene Creed received (Art. VIII).

Presbyterian

See the F16.1 note.

• F16.1 (fathers 3/4; Scripture 4/4): WCF XXV.1–2: the catholic or universal Church is invisible; the visible church ‘out of which there is no ordinary possibility of salvation’.

Reformed Baptist

See the F16.1 note.

• F16.1 (fathers 3/4; Scripture 4/4): 1689 26.1–2: catholic or universal Church invisible; visible saints.

General Baptist

See the F16.1 note.

• F16.1 (fathers 4/4; Scripture 4/4): Orthodox Creed art. 29–30 (OCR-verified): the invisible catholic church ‘can never fall away’; the visible church made up of several distinct congregations, ’that one Catholick Church’.

Anabaptist

See the F16.1 note.

• F16.1 (fathers 3/4; Scripture 3/4): Dordrecht VIII: the church of God, a separated people; no creedal ‘catholic’ language.