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The Mission of a Unified Church: How Unity Serves Evangelism

Rev. C•D•F• Warrington, M.Div.
By Rev. C•D•F• Warrington, M.Div.

Ordained Minister, M.Div.

June 6, 2026

2 min read

mission
Diverse congregation sending missionaries outward from a central church, symbolizing unity in evangelism

The Unity Creed does not treat unity as an end in itself. Christian unity, in the biblical vision, is always missional. The Creed makes this explicit: 'As a unified Body of Christ, spread across geographic areas and made up of many denominations, we can do more together than we can alone.' And the goal of that 'more' is stated clearly: 'many will come to a saving faith' and 'the world will know that we are His disciples.'

Jesus's Prayer and the Mission

John 17 is the biblical foundation. Jesus prays for the unity of all believers 'so that the world may believe that you have sent me' (v. 21) and 'so that the world may know that you sent me' (v. 23). Unity is not merely evidence that Christians like each other. It is evidence that Jesus is who He claimed to be. The church's love for one another is a form of testimony - a visible argument for the truth of the Gospel.

Across Denominations and Geographies

The Creed's vision of unity is deliberately broad: 'spread across geographic areas and made up of many denominations.' This is not a call to organic structural merger or to the erasure of genuine theological distinctives. It is a call to recognize that the Body of Christ is larger than any one tradition, and that collaboration in the mission of God can occur across those boundaries without requiring everyone to become identical.

History bears this out. The great missionary movements of modern history - William Carey's pioneering work, the World Missionary Conference of Edinburgh 1910, the Lausanne Movement - have consistently found that cooperation across traditions multiplies missionary effectiveness. When Baptists, Presbyterians, Anglicans, and Methodists pray together, plan together, and support one another's work, the Gospel goes further.

The World Will Know

The Creed's ultimate aspiration is that the world will know we are Christ's disciples. This echoes John 13:35: 'By this everyone will know that you are my disciples, if you love one another.' The proof of discipleship, in Jesus's own words, is not correct doctrine alone (though doctrine matters), not impressive buildings or programs, not cultural influence. It is love - visible, costly, cross-denominational love that can only be explained by the Spirit of the risen Christ.

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Frequently Asked Questions

How does church unity serve Christian evangelism and mission?

Jesus' prayer in John 17:21 — 'that they may all be one, so that the world may believe that you have sent me' — directly links visible Christian unity to evangelistic credibility. When Christians are united in love and shared confession, their unity becomes a testimony to the truth of the gospel and to Christ's power to reconcile. Division and sectarian conflict, by contrast, undermine the church's witness by making it harder for outsiders to believe that Christianity offers something transformatively different from the world's ordinary social dynamics.

What does the Bible teach about the relationship between unity and witness?

Several key passages connect Christian unity to effective witness. John 13:35 states that 'all people will know that you are my disciples, if you have love for one another,' making love the signature mark of the Christian community visible to the watching world. John 17:20–23 makes Jesus' high-priestly prayer for unity explicitly missional — unity is the means by which the world comes to believe that the Father sent the Son. Ephesians 4:1–6 calls believers to maintain the unity of the Spirit as an expression of the one body, one Spirit, one Lord they share.

What is the difference between visible and invisible unity in Christian theology?

The invisible church refers to the totality of all true believers across all times and places, known only to God, who are united by genuine saving faith. The visible church refers to the institutional expressions of Christianity in the world — denominations, congregations, and ecclesiastical structures — whose unity is imperfect and often divided. The Protestant tradition generally maintains that perfect visible unity is an eschatological ideal, while invisible unity already exists among all the elect. However, ecumenical theology argues that visible unity should increasingly reflect the invisible reality, for the sake of mission and the glory of God.

How have historic confessions addressed the unity of the church?

Many historic confessions address the unity of the church as an article of faith. The Nicene Creed's affirmation of 'one holy catholic and apostolic church' speaks to the church's essential unity. The Westminster Confession of Faith (Chapter 25) distinguishes the invisible church (united in the one body of Christ) from the visible church (which varies in purity). The Belgic Confession (Article 27) describes the holy, catholic church as 'a holy congregation and assembly of the true Christian believers who expect all their salvation in Jesus Christ.' All these confessions locate unity ultimately in Christ rather than in institutional uniformity.

What role does doctrinal confession play in Christian unity?

Doctrinal confession plays an essential role in authentic Christian unity because unity built on the lowest common denominator or the suppression of real disagreements is fragile and ultimately dishonest. Historic Christian unity has been grounded in shared confession of the apostolic faith — the Trinitarian and Christological doctrines of the ecumenical creeds — rather than in organizational merger or cultural homogeneity. Genuine unity is both doctrinal and relational, requiring both agreement on essential gospel truths and the bonds of mutual love and commitment that the New Testament associates with the body of Christ.

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