What is Arianism?

Understanding John 1:1, Colossians 1:15-17, Nicene Creed (325 AD)

Arianism was the most dangerous theological crisis in early Christianity — a teaching that threatened to redefine the identity of Jesus Christ and, with it, the entire foundation of the Christian faith. Named after Arius (c. 256-336 AD), a presbyter (priest) in Alexandria, Egypt, this heresy taught that the Son of God was a created being: exalted above all other creatures, but not eternal, not uncreated, and not truly God in the same sense as the Father.

What Arius Taught

Arius' core claim was captured in his famous slogan: "There was a time when the Son was not" (en pote hote ouk en). His argument:

1. God the Father alone is unbegotten, eternal, and without origin.
2. The Son (Logos/Word) was the first and greatest being the Father created — "before all ages" but not from eternity.
3. The Son was created "out of nothing" (ex nihilo) — not from the Father's own substance.
4. The Son is therefore subordinate to the Father in nature, not just in role. He is "God" in an honorary sense, but not God by nature.
5. The Son can change, grow, and (theoretically) sin — unlike the immutable Father.

Arius could cite Scripture in his defense: Proverbs 8:22 ("The LORD brought me forth as the first of his works"), Colossians 1:15 ("the firstborn over all creation"), and John 14:28 ("the Father is greater than I"). His theology was logically coherent, biblically argued, and enormously popular — which is what made it so dangerous.

Why It Matters

The stakes were existential for Christianity. If Christ is a creature, then:

• Worship of Christ is idolatry. Christians were worshiping a created being — exactly what the first commandment forbids.
• Salvation collapses. Athanasius, Arius' chief opponent, argued that only God can save. A creature cannot bridge the infinite gap between God and humanity. If Christ is not God, his death cannot atone for the sins of the world. As Athanasius wrote: "He became what we are so that we might become what He is" — but this only works if "He" is truly God.
• Revelation is unreliable. If Christ is a creature, then "whoever has seen me has seen the Father" (John 14:9) is misleading at best. We would not know God directly but only through an intermediary creature.

The Council of Nicaea (325 AD)

Emperor Constantine convened the first ecumenical council at Nicaea to resolve the controversy. Approximately 318 bishops attended. The council overwhelmingly condemned Arianism and produced the Nicene Creed, which declared that the Son is:

• "God from God, Light from Light, true God from true God"
• "Begotten, not made" (gennethenta, ou poiethenta) — the Son is eternally generated from the Father, not created
• "Of one substance with the Father" (homoousios to Patri) — the Son shares the same divine nature as the Father

The word homoousios was the decisive term. It meant that the Son is not merely similar to the Father (homoiousios — "of similar substance," the compromise position) but identical in being. This single word drew a permanent boundary between orthodoxy and heresy.

After Nicaea

Arianism did not die at Nicaea. For decades, Arian and semi-Arian emperors persecuted Nicene Christians. Athanasius was exiled five times for defending homoousios. The saying "Athanasius contra mundum" (Athanasius against the world) reflects how isolated the orthodox position sometimes was. It was not until the Council of Constantinople in 381 AD, under Emperor Theodosius I, that Nicene orthodoxy was permanently established.

Modern Echoes

Arianism resurfaces in modern groups that deny Christ's full deity. Jehovah's Witnesses teach that Jesus is Michael the Archangel — a created being, the first of God's creations — which is functionally Arian theology. Unitarianism, some forms of liberal theology, and certain New Age spiritualities also deny the eternal deity of Christ. The Nicene answer remains the Christian church's definitive response: Jesus Christ is "true God from true God, begotten, not made, of one substance with the Father."