Augustine’s Warning For An Age of Christian Nationalism: Duane W.H. Arnold, PhD

Augustine’s Warning For An Age of Christian Nationalism

By Duane W.H. Arnold, PhD

Introduction

In recent years, a troubling development has emerged within certain sectors of the American Church: the conflation of Christian faith with a nationalist political vision. Politicians invoke the name of Jesus as though He were a party boss; pulpits display the national flag more prominently than the cross; media personalities baptize partisan talking points in the name of “faith.” This movement—often labeled Christian nationalism—presents itself as a defense of the Gospel, but it is, in fact, something far older: an attempt to make the City of God serve the interests of the earthly city.

If we listen carefully to The City of God, Augustine of Hippo speaks directly into this moment. His words, written in the wake of Rome’s sack in A.D. 410, are astonishingly relevant to a Church tempted to yoke the Kingdom of God to the fortunes of a nation-state. What follows is a reconstruction of what Augustine might say if he were writing to a cleric in the United States today—followed by commentary connecting each warning to his actual writings.

A Letter from Augustine to a Brother Cleric in America

Brother in Christ,

I have heard with sorrow that some among your flock have begun to speak of this nation as though it were the Kingdom of God itself—its borders holy, its laws divine, its destiny assured by providence in a way that no other people share. Such talk is false, and more than false—it is a sickness of the soul.

The Lord Himself told Pilate, “My kingdom is not of this world.” If it were, He said, His servants would fight to keep Him from the cross. That cross was not raised to make a nation great but to reconcile the world to God. To wrap it in the colors of a single land is to rob it of its glory and to turn the Gospel into a tribal banner.

The City of God and the earthly city are not the same. One is founded on the love of God to the contempt of self; the other on the love of self to the contempt of God. Patriotism, rightly ordered, can be a good thing. But when love of country becomes the controlling passion—when it eclipses the love of God and the love of neighbor—it becomes idolatry.

Remember also that the Church is the Bride of Christ, drawn from every tribe, people, and nation. She cannot be reduced to one language, one culture, one ethnicity, or one political tradition without being torn apart. The soldiers at the cross dared not divide the seamless garment of Christ; yet some now would divide His Body along national lines.

Let your people consider Babylon, which fell in a night. Let them remember Rome, which seemed eternal and now lies in ruins. The fate of nations is dust compared to the City of God, whose citizens are marked not by passports but by the Cross they bear.

Encourage them to be good citizens, to seek the peace of the city where they dwell—but also to live as pilgrims and exiles. Let them serve their country for the sake of the Kingdom, but never confuse the two. And if they will not listen, tell them anyway. It is better to offend the powers of this age than to betray the truth of Christ.

—Augustine, Bishop of Hippo

Commentary and Present Application

The genius of Augustine’s analysis is that it speaks to the heart of our crisis: Christian nationalism is not primarily a political error—it is a theological one. It misorders loves (ordo amoris), elevating the earthly city to the place of the heavenly city. Augustine’s categories expose the temptation in our moment to see America not as a mission field but as a “chosen nation” whose destiny is bound up with God’s Kingdom.

The parallels to late Roman Christianity are unsettling. As the empire declined, many Christians could not imagine the faith apart from Rome’s power and prestige. When the Visigoths sacked the city, it was not merely a political shock—it was a theological one. Augustine’s City of God dismantled the illusion that any empire, however impressive, could bear the weight of eternal hope.

Our present danger lies in allowing the Church to be reduced to the chaplaincy of a political movement. When pulpits become platforms for partisan mobilization, the Sermon on the Mount is quietly set aside for the sake of electoral gain. When moral compromises are excused so long as “our side” wins, the love of self overtakes the love of God.

Augustine’s answer remains bracing: the Church must serve the earthly city, but never be ruled by it. Her mission is catholic in the truest sense—transcending borders, parties, and cultures. She is healthiest when she speaks truth to power, not when she seeks to wield power for herself.

In an age of deep polarization, this is not an easy calling. Yet as Augustine himself wrote to the Donatist bishop Vincentius, “It is better to offend men than to betray the truth of Christ.” The task before us is not to baptize the agendas of Caesar but to proclaim the reign of Christ—whose Kingdom will outlast every nation, including our own.

Key Augustinian Sources Referenced

1. Augustine, The City of God XIV.28 — On the two cities: love of God vs. love of self.

2. Augustine, The City of God XIX.17 — The Christian as pilgrim and exile.

3. Augustine, The City of God V.12; XVIII.2 — The downfall of Babylon and Rome.

4. Augustine, Tractates on the Gospel of John 118.4 — The seamless garment as a symbol of Church unity.

5. Augustine, Letter 93.2 — Better to offend men than betray Christ.