Rejection of Christ's full divine preexistence
Most Unitarian currents reject the idea that Christ is eternally God coequal with the Father.
What it is: This belief denies that Jesus is eternally the same supreme God as the Father in full Trinitarian coexistence.
How the tradition understands it: Many currents hold that Jesus began to exist at human conception or, in minority currents, preexisted in a subordinate way, but not as God coequal with the Father. The decisive point is the rejection of full Nicene divine preexistence.
Textual or traditional basis: Texts about Jesus' human origin and non-ontological readings of John 1 and other passages are important in the debate.
Historical context: This issue was one of the main boundaries between Unitarianism and other Trinitarian Christian traditions.
Common objections: Critics appeal to John 1, Philippians 2, and Colossians 1 in defense of a higher doctrine of preexistence.
Internal variations: The main divergence is between humanitarian Unitarians and currents that allow subordinate preexistence.
Contrary
Colossians 1:15-17
Text used in debates about Christ's preexistence.
Reference: Colossians 1:15-17.
Content: Paul calls Christ the image of the invisible God and the firstborn of all creation.
Use in debate: It is used against Unitarianism by defenders of high Christology; Unitarians respond with functional, sapiential, or subordinational readings.
John 1:1
Central text in Christological dispute.
Reference: John 1:1.
Content: The Johannine prologue describes the Logos in relation to God.
Use in debate: It is one of the most debated passages between Unitarians and Trinitarians, with differing readings on the meaning of divinity and preexistence.
Philippians 2:5-11
Central text on the humiliation and exaltation of Christ.
Reference: Philippians 2:5-11.
Content: The Christological hymn speaks of Christ's humiliation and exaltation.
Use in debate: It is a key text in debates among Trinitarian, Adamic, functional, and preexistence readings of Christ.