The American–Israeli attack on Iran must be judged not only as a political event but as the product of a serious theological confusion within parts of the American governing class. Over several decades, a doctrine commonly called Christian Zionism has moved from fringe Protestant sects into the mainstream of American political life. This doctrine teaches that the Jewish people remain in a separate covenant with God and that the modern State of Israel therefore possesses a special place in the divine plan of history.

From the standpoint of historic Christianity—and especially Catholic theology—this doctrine is false and heretical. It contradicts Scripture. It contradicts the Fathers. It contradicts the entire structure of Christian salvation history. It has created a political mentality in which the ordinary moral limits on war are easily set aside. If a modern state is imagined to occupy a sacred role in divine prophecy, then its wars begin to appear providential, and its enemies appear as obstacles to God’s will.

The statements of the American Defence Secretary Pete Hegseth provide a revealing example of this mindset. Speaking in Jerusalem in 2018, he declared that there was “no reason” why the Jewish Temple could not be rebuilt on the Temple Mount. Such language is not merely careless rhetoric. The Temple Mount is the location of the Al-Aqsa Mosque and the Dome of the Rock, two of the most sacred sites in Islam. Any attempt to replace them with a Jewish temple would ignite a religious war across the Middle East and far beyond it. Yet the possibility is discussed in certain Christian Zionist circles as if it were the fulfilment of prophecy rather than a civilisational catastrophe.

It is difficult to exaggerate the irresponsibility of such thinking. When individuals who speak in these terms also advocate military confrontation with Iran, Catholics are entitled to ask whether theology has been replaced by apocalyptic fantasy.

To understand why this matters, one must return to the foundations of Christian doctrine. Christian Zionism depends on the claim that the Jewish people remain in a separate covenant with God that continues alongside the Christian covenant established by Christ. The New Testament explicitly rejects this idea.

The Apostle Paul writes in Galatians 3:28–29:

“There is neither Jew nor Greek… for ye are all one in Christ Jesus. And if ye be Christ’s, then are ye Abraham’s seed, and heirs according to the promise.”

Here the promise made to Abraham is explicitly transferred to those who belong to Christ, regardless of ethnicity.

Similarly, Ephesians 2:14–16 teaches that Christ abolished the division between Jew and Gentile:

“For he is our peace, who hath made both one, and hath broken down the middle wall of partition between us… to make in himself of twain one new man, so making peace.”

The Epistle to the Hebrews goes further still. Speaking of the covenant established through Christ, it declares in Hebrews 8:13:

“In that he saith, A new covenant, he hath made the first old. Now that which decayeth and waxeth old is ready to vanish away.”

The logic is unmistakable. The covenant of Christ replaces and fulfils the Mosaic covenant. There are not two parallel paths of salvation.

Christ Himself expresses the same principle in John 10:16:

“And other sheep I have, which are not of this fold: them also I must bring… and there shall be one fold, and one shepherd.”

Christianity therefore teaches the existence of one people of God, not two.

The Fathers of the Church understood these passages in precisely this way. Justin Martyr, writing in the second century in his Dialogue with Trypho, explains that the covenant promised by the prophets is fulfilled in Christ and extended to the nations:

“The new law requires you to keep perpetual sabbath, and you, because you are idle for one day, suppose you are pious… The true spiritual Israel are we who have been led to God through this crucified Christ.”

Justin’s argument is simple: the promises of Israel are realised in the Church.

Irenaeus of Lyons teaches the same in Against Heresies:

“The law remained until the coming of the Lord… but from the Lord’s advent the new covenant which brings peace has gone forth over the whole earth.”

For Irenaeus, the Gospel completes the history of Israel and opens the covenant to all nations.

St Augustine later emphasises that the Jewish rites cannot serve as conditions of salvation after Christ:

“The observances of the old law… were shadows of things to come; once the reality has appeared, the shadows pass away.”

None of these writers imagines that the Jewish people remain in a separate salvific covenant. Such an idea would have appeared absurd to them. Christian Zionism therefore represents a radical departure from the historic teaching of the Church. Its origins lie not in ancient Christianity but in nineteenth-century Protestant speculation about biblical prophecy. In that system, the modern return of Jews to Palestine is interpreted as the beginning of a prophetic drama leading to the end of the world.

This interpretation would have baffled the Fathers and mediaeval theologians alike. For them, the coming of Christ marked the decisive turning point in salvation history. The promises to Israel were fulfilled in the Church, not postponed until the twentieth century. Yet this modern theology has acquired enormous political influence in the United States. Millions of American evangelicals now believe that supporting Israel’s territorial expansion is a religious duty.

The consequences are profound. Once a modern state is seen as the instrument of prophecy, political judgement becomes distorted. Military conflict can be portrayed as the unfolding of God’s plan. Catholic moral theology developed the doctrine of Just War precisely to prevent such distortions. The tradition begins with St Augustine, who argued that war may sometimes be necessary but must always serve justice and peace rather than hatred or ambition.

St Thomas Aquinas later summarised the doctrine in three essential conditions (Summa Theologiae, II–II, q.40):

1. Legitimate authority – the war must be declared by a proper ruler.
2. Just cause – the enemy must have inflicted a real injury.
3. Right intention – the aim must be peace, not domination or vengeance.

Later Catholic teaching expanded these principles. The Catechism of the Catholic Church states that armed force may be justified only if several strict conditions are met, including the certainty of grave damage by the aggressor, the exhaustion of peaceful alternatives, proportionality, and a serious prospect of success.

These conditions are cumulative. If any one of them fails, the war is unjust. Measured by these standards, the American–Israeli attack on Iran is morally dubious at best.

The first difficulty concerns just cause. The justification offered for the attack rests largely on fears about Iran’s potential future capabilities, particularly regarding nuclear weapons. Yet Catholic teaching has traditionally rejected preventive war—war launched to forestall hypothetical future threats. Without clear evidence of imminent aggression, the moral basis for such a war becomes extremely weak.

The second difficulty concerns last resort. The Church teaches that war may be undertaken only after peaceful alternatives have been exhausted. Yet the diplomatic history of the Iranian nuclear issue shows repeated cycles of negotiation, sanctions, and renewed negotiation. Whether diplomacy had truly reached its final limits remains highly questionable.

The third issue is proportionality. Even if Iran presents a genuine security challenge, the destruction and instability likely to follow a major regional war could exceed the harm it seeks to prevent. Iran is not a minor state but a large civilisation with deep regional alliances. Military escalation could ignite conflicts across the Middle East.

Finally, there is the question of reasonable success. Destroying facilities and killing soldiers is not the same as achieving peace. The long-term outcome of war with Iran is unpredictable and could easily involve a widening conflict.

From a Catholic perspective, therefore, the moral case for this war appears deeply uncertain. The deeper problem, however, lies not only in the specific conflict but in the mentality that made it conceivable. Christian Zionism encourages a worldview in which Middle Eastern politics becomes a stage for prophetic fulfilment. Within that framework, wars are interpreted not merely as strategic decisions but as steps in a cosmic drama.

This mindset is extraordinarily dangerous. It transforms political leaders into actors in a supposed divine script. Prudence gives way to ideological certainty. Catastrophe is reframed as destiny. The comments of Pete Hegseth about rebuilding the Temple on the Temple Mount illustrate the problem perfectly. Such language reveals a political imagination shaped less by diplomacy than by eschatology. When that imagination becomes entangled with military power, the results can be disastrous.

The American–Israeli attack on Iran should therefore concern Catholics not only as a geopolitical crisis but as a symptom of a deeper theological disorder.

Christian Zionism contradicts the teaching of Scripture and the Fathers. It introduces into Christian thought the idea of a separate covenant with the Jews that survives alongside the Church. In doing so, it undermines the universality of Christ’s salvation and distorts the moral judgement of those who embrace it. War conducted under the influence of such theology risks becoming something different from the limited defensive warfare permitted by Catholic doctrine.

The Church’s tradition offers a more sober vision. There is one covenant fulfilled in Christ, one people of God drawn from all nations, and one moral law governing the conduct of rulers. War may sometimes be necessary, but it must always remain subject to strict limits ordered toward justice and peace. When political leaders abandon those limits and begin to speak the language of prophecy, Christians have not only the right but the duty to protest.

The attack on Iran deserves such protest.