The Doctrine of the Trinity Against Oneness Theology
A condemnation of Oneness theology as a modern form of Modalism
THEOLOGY
5/8/20246 min read
The doctrine of the Trinity has stood at the center of orthodox Christianity since the earliest centuries of the church. While modern Oneness Pentecostalism insists that God is a single divine Person who manifests Himself in different modes or offices, historic Christianity has consistently confessed that God exists eternally as one essence in three distinct Persons: Father, Son, and Holy Spirit. Though Oneness advocates often reject the term “modalism,” their theology closely parallels the ancient modalistic errors condemned by the early church because it denies the eternal personal distinctions within the Godhead.
HISTORICAL CONSIDERATIONS
Historically, modalism emerged in the second and third centuries through teachers such as Noetus, Praxeas, and Sabellius. These men attempted to preserve their understanding of monotheism by teaching that Father, Son, and Holy Spirit were not distinct Persons, but merely different manifestations or modes of the one God. According to Sabellianism, God acted as Father in creation, Son in redemption, and Holy Spirit in sanctification. However, the church condemned this teaching because it contradicted Scripture’s presentation of simultaneous personal distinctions within the Godhead. Tertullian strongly opposed Praxeas and argued that modalism confused the Persons and destroyed the biblical relationship between the Father and the Son. Likewise, Hippolytus condemned Noetus for teaching that the Father Himself suffered on the cross, a view sometimes called Patripassianism.
The early church rejected modalism not because it denied the deity of Christ, but because it denied the tri-personal nature of God revealed in Scripture. Starting with the Synod of Rome (A.D. 220) where Sabellius and his teaching, which came to be known as Sabellianism, were condemned and he was ultimately excommunicated from the church. The councils of Nicaea (A.D. 325) and Constantinople (A.D. 381) further affirmed that the Son and the Spirit are fully divine and eternally distinct from the Father while sharing the same divine essence. The Nicene Creed reading:
"We believe in one God, the Father Almighty, Maker of heaven and earth, and of all things visible and invisible.
And in one Lord Jesus Christ, the only-begotten Son of God, begotten of the Father before all worlds; God of God, Light of Light, very God of very God; begotten, not made; being of one substance with the Father; by whom all things were made.
And in the Holy Spirit, the Lord and Giver of Life, who proceeds from the Father, who with the Father and the Son together is worshiped and glorified, who spoke by the prophets."
therefore articulated the historic Christian understanding of one God existing eternally in three Persons.
BIBLICAL CONSIDERATIONS
Biblically, the doctrine of the Trinity arises from the full witness of Scripture. The Bible clearly teaches monotheism. The Shema in Deuteronomy 6:4 declares, “Hear, O Israel: The LORD our God is one LORD.” There is only one true God. Yet Scripture also reveals three distinct Persons who are each identified as fully divine.
The Father is clearly called God throughout Scripture (John 6:27; 1 Corinthians 8:6). The Son is likewise identified as God. John 1:1 states, “In the beginning was the Word, and the Word was with God, and the Word was God.” This verse simultaneously distinguishes the Word from God the Father (“with God”) while affirming the full deity of the Word (“was God”). John 1:14 identifies this Word as Jesus Christ who became flesh. Thomas confessed Christ as “My Lord and my God” in John 20:28, and Paul declared in Titus 2:13 that believers look for “the glorious appearing of the great God and our Saviour Jesus Christ.”
The Holy Spirit is also presented as fully divine. In Acts 5:3–4, Peter rebuked Ananias for lying to the Holy Ghost and then declared that he had lied to God. Furthermore, the Spirit possesses divine attributes such as omniscience (1 Corinthians 2:10–11) and eternality (Hebrews 9:14).
At the same time, Scripture distinguishes the Persons from one another. During the baptism of Jesus Christ in Matthew 3:16–17, the Son stands in the water, the Spirit descends like a dove, and the Father speaks from heaven. This cannot be explained merely as one Person acting in different modes or relations because all three Persons are simultaneously present and interacting. Likewise, in John 17, Jesus prays to the Father using genuine personal communication, not merely speaking to another manifestation of Himself. Jesus repeatedly distinguished His will from the Father’s will (Luke 22:42) and spoke of the Father sending the Son into the world (John 3:17).
The Great Commission in Matthew 28:19 further demonstrates Trinitarian doctrine: believers are to be baptized “in the name of the Father, and of the Son, and of the Holy Ghost.” The singular word “ὄνομα” (onoma - name) points to the unity of the divine essence, while the threefold personal designation reveals distinction within the Godhead. Similarly, Paul closed 2 Corinthians with a Trinitarian benediction: “The grace of the Lord Jesus Christ, and the love of God, and the communion of the Holy Ghost, be with you all” (2 Corinthians 13:14).
EXCURSUS: BAPTISM FORUMULA AND ACTS
A common question in discussions about baptism is whether the book of Acts replaces Jesus’ command in Matthew 28:19 with a different baptismal formula. This is not the case, a careful reading of Scripture shows that Acts does not contradict or revise Jesus in Matthew, but rather describes how the apostles carried out Jesus’ command in practice.
In Matthew 28:19, Jesus gives a direct command: “Baptizing them in the name of the Father, and of the Son, and of the Holy Ghost.” I will note again that the key grammatical detail is that the Greek word for “name” is singular, followed by a threefold identification. This indicates unity of divine authority while also distinguishing the Father, the Son, and the Holy Spirit. This passage functions as a prescriptive command from Christ himself, defining the theological fullness of Christian baptism.
In the book of Acts, however, baptism is consistently described in phrases such as “in the name of Jesus Christ” (Acts 2:38) and “in the name of the Lord Jesus” (Acts 8:16; 19:5). It is important to recognize that Acts is a historical narrative, not a liturgical manual. It records what the apostles did, not necessarily a verbatim formula spoken in every instance. Narrative literature in Scripture often summarizes actions without repeating full theological wording each time, they are descriptive works.
The phrase “in the name of Jesus” in Acts does not indicate a different baptismal authority or a replacement of Matthew 28:19. Rather, in biblical language, “in the name of” often refers to authority, identity, or representation. Therefore, baptism “in the name of Jesus” emphasizes that Christian baptism is performed under the authority of Christ, who is the revealed Son sent by the Father and who bestows the Holy Spirit.
Additionally, Acts itself shows variation in phrasing (“in the name of the Lord,” “in the name of Jesus Christ”), which demonstrates that Luke is not presenting a rigid formula but a consistent theological emphasis. If Acts were intended to replace Matthew 28:19, we would expect uniform wording and explicit correction of Jesus’ command, which is never found in the text.
A coherent reading of both passages shows harmony rather than contradiction. Matthew 28:19 provides the full revelation of the divine identity involved in baptism, while Acts highlights the apostolic focus on the saving authority of Jesus Christ. The two are not competing formulas but complementary descriptions: baptism is grounded in the authority of Christ and rooted in the full revelation of God as Father, Son, and Holy Spirit.
SYSTEMATIC CONSIDERATIONS
Systematically stated, the doctrine of the Trinity teaches that there is one and only one true and living God who eternally exists in three distinct Persons: Father, Son, and Holy Spirit. These three Persons are co-equal, co-eternal, and consubstantial, sharing fully and indivisibly in the one divine essence. The Father is not the Son, the Son is not the Spirit, and the Spirit is not the Father; yet each Person is fully God. The distinctions are personal, not essential, and therefore Christianity remains fully monotheistic while affirming the tri-personal revelation of God in Scripture.
CONCLUSION
In conclusion, the witness of Scripture, the testimony of the early church, and the settled doctrine of historic orthodox Christianity collectively affirm that the God of the Bible exists eternally as one divine essence in three distinct Persons: Father, Son, and Holy Spirit. Any theological system that denies or collapses these eternal personal distinctions cannot be reconciled with the biblical revelation of God. Oneness theology, while seeking to preserve monotheism, does so at the expense of the clear scriptural teaching that the Father sends the Son, the Son intercedes with the Father, and the Spirit proceeds to and works personally within the people of God. These are not merely differing manifestations of a single divine Person, but real and eternal distinctions within the Godhead itself. For this reason, Oneness theology must be rejected as a contemporary expression of modalistic theology and a non-Trinitarian interpretation of Scripture and as inconsistent with the historic, creedal, and apostolic faith of the Christian church. The doctrine of the Trinity alone faithfully accounts for the full biblical testimony and must therefore be affirmed without compromise as the orthodox understanding of the one true God. To whom be glory now and forever.