What is Eastern Orthodoxy?
Question 09042
Eastern Orthodoxy is the second largest Christian communion in the world, with an estimated 220 million adherents, and yet it remains largely unfamiliar to Western evangelicals. Understanding what Eastern Orthodoxy teaches, how it differs from both Roman Catholicism and evangelical Protestantism, and where it stands in relation to the gospel of Scripture is essential for any Christian who takes seriously the call to “test everything” (1 Thessalonians 5:21).
Historical Origins
The Eastern Orthodox Church traces its origins to the apostolic church and regards itself as the authentic continuation of the faith delivered once for all to the saints. Its institutional history is bound up with the Roman Empire’s division into Western and Eastern halves, with Constantinople (modern Istanbul) serving as the centre of the Eastern church while Rome served as the centre of the Western church. The growing theological, liturgical, and political tensions between East and West culminated in the Great Schism of 1054, when the papal legate in Constantinople and the Ecumenical Patriarch excommunicated each other. While the reality was more complex than a single dramatic rupture, 1054 marks the conventional date of the division between Roman Catholicism and Eastern Orthodoxy.
The primary theological issue in the schism was the filioque clause: the Western church’s addition of “and the Son” to the Nicene Creed’s statement about the procession of the Holy Spirit. The original creed stated that the Spirit “proceeds from the Father.” The Western church added “and the Son” (filioque), and the Eastern church regarded this as both a theological error and an unauthorised alteration of a creed that belonged to the whole church and could not be changed by one part of it unilaterally. Behind this specific dispute lay deeper questions about papal authority, the relationship between Rome and the other ancient patriarchates, and the proper relationship between theological development and the received tradition.
Key Orthodox Beliefs and Practices
Eastern Orthodoxy holds to the authority of Scripture and Sacred Tradition as a single, unified source of divine revelation. This is a significant difference from the Protestant commitment to sola Scriptura. For the Orthodox, the church’s tradition, including the decisions of the seven Ecumenical Councils (from Nicaea in 325 to Second Nicaea in 787), the writings of the Church Fathers, the liturgy, and the consensus of the faithful across the centuries, is not a supplement to Scripture but the context within which Scripture is properly read and understood. The practical consequence is that Orthodox theology is shaped by tradition in ways that Protestant theology is not, and positions that evangelicals regard as lacking biblical warrant are defended by the Orthodox on the grounds that they represent the received teaching of the whole church across time.
The doctrine of salvation in Orthodoxy differs substantially from the evangelical Protestant understanding. Where evangelicals speak of justification by faith alone as a forensic declaration, Orthodoxy speaks of theosis, or deification: the process by which human beings are progressively transformed into the likeness of God. This is not the claim that humans become God in essence, but the belief that through participation in Christ, through the sacraments, through ascetic practice, and through the life of the church, the believer is gradually united to God and comes to share in the divine nature (2 Peter 1:4). Salvation in Orthodoxy is understood more as a process of transformation than as a once-for-all legal declaration, and this has profound implications for how assurance, faith, and works are understood.
The sacraments occupy a central place in Orthodox life. Baptism is understood as the means of regeneration and is administered to infants, followed immediately by chrismation (confirmation) and the reception of communion. The Eucharist is understood as the true body and blood of Christ, though Orthodoxy has resisted the Western philosophical precision of transubstantiation and prefers to describe the mystery as real without explaining the mechanism. Icons hold a distinctive place in Orthodox worship. The Second Council of Nicaea (787) affirmed the veneration of icons as distinct from idolatry, teaching that the honour given to the icon passes to the one it represents. Orthodox churches are saturated with iconography, and the veneration of icons through kissing, bowing, and offering incense is a standard feature of Orthodox worship.
Where Orthodoxy Departs from Scripture
An evangelical assessment of Eastern Orthodoxy must be honest about both its strengths and its errors. Orthodoxy has preserved genuine theological treasures: its Trinitarian theology is profound, its commitment to the early creeds is admirable, and its resistance to the liberalising tendencies that have gutted much of Western Protestantism is genuinely commendable. The Orthodox tradition has maintained a seriousness about worship, a reverence for the holiness of God, and a richness of theological reflection that parts of evangelicalism would do well to learn from.
That said, there are substantial points at which Orthodoxy departs from what Scripture teaches. The elevation of tradition to the level of Scripture creates a situation in which practices and doctrines that lack clear biblical warrant, including the veneration of icons, prayers to the saints, the perpetual virginity of Mary, and the Marian title Theotokos (God-bearer) used in ways that effectively exalt Mary beyond her biblical role, are defended on the authority of the church’s tradition rather than on the authority of the text. The sacramental system, in which baptism regenerates, the Eucharist conveys grace, and salvation is understood as a lifelong process of participation in the sacraments and the life of the church, stands in tension with the New Testament’s presentation of salvation as a gift received by faith (Ephesians 2:8-9) and justification as a completed declaration rather than an ongoing process.
The doctrine of theosis, while drawing on genuine biblical language about participation in the divine nature, can obscure the distinction between Creator and creature that Scripture carefully maintains. The absence of a clear doctrine of assurance, replaced by what is often described as a “humble hope” about one’s salvation, conflicts with the New Testament’s confidence that believers can know they have eternal life (1 John 5:13). The role of the priesthood as mediator of sacramental grace undermines the sufficiency of Christ’s once-for-all sacrifice (Hebrews 7:27; 9:12; 10:10) and the priesthood of all believers (1 Peter 2:9).
So, now what?
Eastern Orthodoxy is a serious tradition with deep roots, and it deserves engagement that is neither dismissive nor uncritical. Evangelicals can and should appreciate the Orthodox commitment to Trinitarian orthodoxy, to the incarnation, and to the historical rootedness of the faith. At the same time, the gospel itself is at stake in the differences. Salvation by grace through faith, apart from sacramental works and apart from human merit, is the non-negotiable centre of the biblical message. Where any tradition, however ancient and however reverent, departs from that centre, it must be measured by Scripture and found wanting. The standard is not what the church has taught across the centuries, however valuable that testimony may be. The standard is what God has spoken in His Word.
“For by grace you have been saved through faith. And this is not your own doing; it is the gift of God, not a result of works, so that no one may boast.” Ephesians 2:8-9