How Christian Denominations Reconcile Ephesians 4:4–6 in a Divided Religious Landscape

Few passages in the New Testament create a greater theological challenge for Christianity than Ephesians 4:4–6. In only three verses, the Apostle Paul presents one of the strongest declarations of unity ever written: “There is one body and one Spirit… one Lord, one faith, one baptism, one God and Father of all, who is over all and through all and in all.” The statement appears absolute. There is one body. One faith. One baptism. One God. Yet nearly two thousand years later, Christianity exists across thousands of denominations, traditions, movements, and theological communities.

The question naturally follows: if Christianity confesses one body, why does Christianity appear so divided?

The answer has been debated since the earliest centuries of the Church. Different Christian traditions have developed different ways of understanding what Paul meant by “one.” Some interpret it primarily as a spiritual unity that exists among all true believers regardless of institutional boundaries. Others argue that the passage points toward a visible, historical unity expressed through apostolic authority, sacramental life, and shared doctrine. Still others emphasize that Paul’s message is not calling Christians to eliminate all differences but to preserve unity around the essentials of the faith.

The tension between unity and division is not a modern problem. In fact, Ephesians was written to a Christian community already wrestling with differences. The early Church existed among Jews and Gentiles, people from different cultures, social classes, and religious backgrounds. Paul’s message was not directed at a perfectly uniform community. It was directed at a diverse community being called to recognize the deeper reality that united them. Biblical scholars often identify Ephesians 4:4–6 as a sevenfold description of Christian unity, moving from the Church’s identity, to Christ’s lordship, to God’s ultimate authority. (Wiley Online Library)

The first major question Christian traditions must answer is: what does “one body” mean?

For Roman Catholic, Eastern Orthodox, and some Anglican traditions, “one body” has historically been understood as pointing toward a visible Church united through apostolic succession, shared worship, and sacramental continuity. The Church is not merely a collection of individual believers who happen to share similar beliefs; it is a historical community established by Christ and continued through generations.

This understanding emphasizes that Christianity is not only a personal relationship with God but participation in a communal body. From this perspective, division among Christians is not simply disagreement; it is a wound within the visible expression of Christ’s Church.

The Protestant Reformation challenged certain aspects of this visible unity, arguing that institutional structures could depart from biblical truth. Many Protestant traditions therefore developed a distinction between the “visible church” and the “invisible church.” The visible church consists of earthly congregations and denominations, while the invisible church consists of all genuine believers united spiritually to Christ.

Under this framework, Ephesians 4:4–6 is understood as declaring that all true Christians already share a spiritual unity regardless of denominational separation. Differences in governance, worship style, and secondary theological questions do not necessarily destroy the deeper unity created by the Holy Spirit. (Ligonier Ministries)

This interpretation raises another difficult question: if unity is spiritual, how much disagreement can exist before unity is broken?

The phrase “one faith” becomes central to that discussion.

Some traditions interpret “one faith” as referring to the shared trust Christians place in Jesus Christ as Lord and Savior. Under this interpretation, Christians may disagree about issues such as church leadership structures, the timing of end-times events, or forms of worship while still sharing the same essential faith.

Other traditions emphasize that “one faith” also refers to a defined body of doctrine handed down through the apostles. From this perspective, unity requires agreement on foundational teachings about God, Christ, salvation, and the nature of the Church. (BioLogos)

The challenge is determining where the boundary exists between legitimate diversity and theological division.

Christian history demonstrates that believers have often disagreed passionately while still claiming loyalty to the same Lord. The early Church debated questions such as the nature of Christ, the relationship between divine and human nature, and the proper understanding of baptism. Those debates eventually produced historic creeds intended to clarify what Christianity considered essential belief.

The result is a paradox: Christianity has historically used doctrinal definitions both to protect unity and, at times, to separate communities from one another.

The phrase “one baptism” creates another major point of discussion.

Most Christian traditions agree that baptism is central to Christian identity, but they disagree about its meaning, timing, and method. Some traditions baptize infants, believing baptism incorporates children into the covenant community. Others practice believer’s baptism, arguing that baptism should follow an individual profession of faith.

Some traditions practice baptism by immersion, while others recognize pouring or sprinkling as valid. Yet despite these differences, many Christian communities see Paul’s statement as emphasizing that baptism is the common entrance into the life of Christ, not a marker dividing believers from one another. (Enduring Word)

The most provocative part of Ephesians 4:4–6 may be that Paul does not say Christians must create unity. He says Christians must maintain it.

Earlier in the chapter, Paul writes that believers should be “eager to maintain the unity of the Spirit in the bond of peace.” The implication is that unity already exists because God created it. Human beings do not manufacture Christian unity; they either reflect it or fail to live according to it. (Wiley Online Library)

This distinction changes the entire conversation.

The question is not merely, “How can Christians become one?”

The deeper question is, “Why do Christians who claim to already be one continue to live as though they are separate?”

Denominational differences are often treated as evidence that Christianity has failed to achieve Paul’s vision. But many Christians argue the opposite: diversity does not necessarily contradict unity. A human body has many different parts performing different functions, yet it remains one body. Paul himself later expands this idea in Ephesians 4 by explaining that Christ gives different gifts and roles to believers for the purpose of building up the same body.

The disagreement, therefore, is not whether unity matters. Nearly all Christian traditions affirm that it does. The disagreement is over what unity requires.

Does unity require one institution?

Does unity require agreement on every doctrine?

Does unity require only a shared confession of Jesus Christ?

Or does Ephesians 4:4–6 challenge Christians to pursue something deeper than institutional agreement—a unity rooted in humility, love, truth, and submission to the same Lord?

Perhaps the greatest challenge of this passage is not directed at different denominations. It is directed at every individual believer.

Paul’s words confront the temptation to make personal preference the standard of Christian identity. The passage does not say there is one culture, one personality, one worship style, or one human tradition. It says there is one Lord.

The ultimate question raised by Ephesians 4:4–6 is not simply why Christianity has many churches. The deeper question is whether those churches, despite their differences, are faithfully reflecting the one Christ they all claim to serve.

If Jesus Christ truly established one body, one Spirit, one hope, one Lord, one faith, one baptism, and one Father, then every generation of Christians must wrestle with the same challenge:

Are our divisions protecting the truth of Christianity, or are they revealing how far Christians have drifted from the unity that Christ and the apostles called them to preserve?