05/26/2026
By Cameron Riecker
There is one early Church Father that creates a serious problem for modern Protestant theology:
St. Ignatius of Antioch.
Why? Because Ignatius was not a medieval Catholic theologian writing centuries later. He was a disciple of the apostles themselves — particularly connected to St. John the Apostle according to early Christian tradition.
This means that when Ignatius speaks about the Eucharist, Church authority, bishops, and the Catholic Church, he is giving us a window into what the apostolic Church actually believed near the end of the first century.
Around 107 AD, on his way to martyrdom in Rome, Ignatius wrote against heretics who:
“abstain from the Eucharist because they do not confess that the Eucharist is the flesh of our Savior Jesus Christ.”
That is not symbolic language.
He also wrote:
“Wherever Jesus Christ is, there is the Catholic Church.”
This is the earliest known use of the phrase “Catholic Church” in Christian history.
Ignatius also speaks repeatedly of:
• bishops
• priests (presbyters)
• deacons
• unity around the altar
• obedience to Church authority
In other words, the Christianity reflected in Ignatius looks unmistakably Catholic in structure, sacramental theology, and ecclesiology.
Even some Reformers recognized how difficult Ignatius was for Protestant theology. John Calvin questioned the authenticity of some Ignatian letters, though the shorter seven-letter recension is now widely accepted by scholars as authentic.
St. Ignatius matters because he stands extremely close to the apostolic age. He is not evidence of a “later corruption” of Christianity. He is evidence of what Christians already believed at the dawn of the second century.
And what he describes is not modern Protestantism.
It is recognizably Catholic Christianity.
