Don Closson argues that Constantine did not impose the doctrine of the Trinity on the church, demonstrating the actual role of church leaders and Constantine.

This article is also available in Spanish.

The doctrine of the Trinity is central to the uniqueness of Christianity. It holds that the Bible teaches that “God eternally exists as three persons, Father, Son, and Holy Spirit, and each person is fully God, and there is one God.”{1} So central is this belief that it is woven into the words Jesus gave the church in His Great Commission, telling believers to ” . . . go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit . . .” (Matthew 28:19).

It is not surprising, then, that the doctrine of the Trinity is one of the most denigrated and attacked beliefs by those outside the Christian faith. Both Mormons and Jehovah’s Witnesses reject this central tenet and expend considerable energy teaching against it. Much of the instruction of the Jehovah’s Witness movement tries to convince others that Jesus Christ is a created being, not having existed in eternity past with the Father, and not fully God. Mormons have no problem with Jesus being God; in fact, they make godhood available to all who follow the teachings of the Church of Latter-day Saints. One Mormon scholar argues that there are three separate Gods–Father, Son, and Holy Spirit–who are one in purpose and in some way still one God.{2} Another writes, “The concept that the Father, Son, and Holy Ghost are one God is totally incomprehensible.”{3}

Among the world religions, Islam specifically teaches against the Trinity. Chapter four of the Koran argues, “Say not ‘Trinity’: desist: it will be better for you: for Allah is One God: glory be to Him: (far Exalted is He) above having a son” (4:171). Although Muhammad seems to have wrongly believed that Christians taught that the Trinity consisted of God the Father, Mary the Mother, and Jesus the Son, they reject as sinful anything being made equivalent with Allah, especially Jesus.

A common criticism by those who reject the doctrine of the Trinity is that the doctrine was not part of the early church, nor a conscious teaching of Jesus Himself, but was imposed on the church by the Emperor Constantine in the early fourth century at the Council of Nicea. Mormons argue that components of Constantine’s pagan thought and Greek philosophy were forced on the bishops who assembled in Nicea (located in present day Turkey). Jehovah’s Witnesses believe that the Emperor weighed in against their view, which was the position argued by Arius at the council, and, again, forced the church to follow.

In the remaining portions of this article, we will discuss the impact the three key individuals–Arius, Constantine, and Athanasius–had on the Council of Nicea. We will also respond to the charge that the doctrine of the Trinity was the result of political pressure rather than of thoughtful deliberation on Scripture by a group of committed Christian leaders.


Let’s look first at the instigator of the conflict that resulted in the council, a man named Arius.

Arius was a popular preacher and presbyter from Libya who was given pastoral duties at Baucalis, in Alexandria, Egypt. The controversy began as a disagreement between Arius and his bishop, Alexander, in 318 A.D. Their differences centered on how to express the Christian understanding of God using current philosophical language. This issue had become important because of various heretical views of Jesus that had crept into the church in the late second and early third centuries. The use of philosophical language to describe theological realities has been common throughout the church age in an attempt to precisely describe what had been revealed in Scripture.

Alexander argued that Scripture presented God the Father and Jesus as having an equally eternal nature. Arius felt that Alexander’s comments supported a heretical view of God called Sabellianism which taught that the Son was merely a different mode of the Father rather than a different person. Jehovah’s Witnesses argue today that the position held by Arius was superior to that of Alexander’s.

Although some historians believe that the true nature of the original argument has been clouded by time and bias, the dispute became so divisive that it caught the attention of Emperor Constantine. Constantine brought the leaders of the church together for the first ecumenical council in an attempt to end the controversy.

It should be said that both sides of this debate held to a high view of Jesus and both used the Bible as their authority on the issue. Some have even argued that the controversy would never have caused such dissension were it not inflamed by political infighting within the church and different understandings of terms used in the debate.

Arius was charged with holding the view that Jesus was not just subordinate to the Father in function, but that He was of an inferior substance in a metaphysical sense as well. This went too far for Athanasius and others who were fearful that any language that degraded the full deity of Christ might place in question His role as savior and Lord.

Some believe that the position of Arius was less radical than is often perceived today. Stuart Hall writes, “Arius felt that the only way to secure the deity of Christ was to set him on the step immediately below the Father, who remained beyond all comprehension.”{4} He adds that whatever the differences were between the two sides, “Both parties understood the face of God as graciously revealed in Jesus Christ.”{5}

Emperor Constantine

Many who oppose the doctrine of the Trinity insist that the emperor, Constantine, imposed it on the early church in 325 A.D. Because of his important role in assembling church leaders at Nicea, it might be helpful to take a closer look at Constantine and his relationship with the church.

Constantine rose to supreme power in the Roman Empire in 306 A.D. through alliance-making and assassination when necessary. It was under Constantine’s Edict of Milan in 313 A.D. that persecution of the church ended and confiscated church properties were returned.

However, the nature of Constantine’s relationship to the Christian faith is a complex one. He believed that God should be appeased with correct worship, and he encouraged the idea among Christians that he “served their God.”{6} It seems that Constantine’s involvement with the church centered on his hope that it could become a source of unity for the troubled empire. He was not so much interested in the finer details of doctrine as in ending the strife that was caused by religious disagreements. He wrote in a letter, “My design then was, first, to bring the diverse judgments found by all nations respecting the Deity to a condition, as it were, of settled uniformity; and, second to restore a healthy tone to the system of the world . . .”{7} This resulted in him supporting various sides of theological issues depending on which side might help peace to prevail. Constantine was eventually baptized shortly before his death, but his commitment to the Christian faith is a matter of debate.

Constantine participated in and enhanced a recently established tradition of Roman emperors meddling in church affairs. In the early church, persecution was the general policy. In 272, Aurelian removed Paul of Samosata from his church in Antioch because of a theological controversy. Before the conflict over Arius, Constantine had called a small church synod to resolve the conflict caused by the Donatists who argued for the removal of priests who gave up sacred writings during times of persecution. The Donatists were rebuked by the church synod. Constantine spent five years trying to suppress their movement by force, but eventually gave up in frustration.

Then, the Arian controversy over the nature of Jesus was brought to his attention. It would be a complex debate because both sides held Jesus in high regard and both sides appealed to Scripture to defend their position. To settle the issue, Constantine called the council at Nicea in 325 A.D. with church leaders mainly from the East participating. Consistent with his desire for unity, in years to come Constantine would vacillate from supporting one theological side to the other if he thought it might end the debate.

What is clear is that Constantine’s active role in attempting to resolve church disputes would be the beginning of a new relationship between the empire and the church.


The Council of Nicea convened on May 20, 325 A.D. The 230 church leaders were there to consider a question vital to the church: Was Jesus Christ equal to God the Father or was he something else? Athanasius, only in his twenties, came to the council to fight for the idea that, “If Christ were not truly God, then he could not bestow life upon the repentant and free them from sin and death.”{8} He led those who opposed the teachings of Arius who argued that Jesus was not of the same substance as the Father.

The Nicene Creed, in its entirety, affirmed belief “. . . in one God, the Father almighty, Maker of all things visible and invisible. And in one Lord Jesus Christ, the Son of God, begotten of the Father, Light of Light, very God of very God, begotten, not made, being of one substance with the Father; by whom all things were made; who for us men, and for our salvation, came down and was incarnate and was made man; he suffered, and the third day he rose again, ascended into heaven; from thence he shall come to judge the quick and the dead. And in the Holy Ghost.” {9}

The council acknowledged that Christ was God of very God. Although the Father and Son differed in role, they, and the Holy Spirit are truly God. More specifically, Christ is of one substance with the Father. The Greek word homoousios was used to describe this sameness. The term was controversial because it is not used in the Bible. Some preferred a different word that conveyed similarity rather than sameness. But Athanasius and the near unanimous majority of bishops felt that this might eventually result in a lowering of Christ’s oneness with the Father. They also argued that Christ was begotten, not made. He is not a created thing in the same class as the rest of the cosmos. They concluded by positing that Christ became human for mankind and its salvation. The council was unanimous in its condemnation of Arius and his teachings. It also removed two Libyan bishops who refused to accept the creed formulated by the Council.

The growing entanglement of the Roman emperors with the church during the fourth century was often less than beneficial. But rather than Athanasius and his supporters seeking the backing of imperial power, it was the Arians who actually were in favor of the Emperor having the last word.


Did Constantine impose the doctrine of the Trinity on the church? Let’s respond to a few of the arguments used in support of that belief.

First, the doctrine of the Trinity was a widely held belief prior to the Council of Nicea. Since baptism is a universal act of obedience for new believers, it is significant that Jesus uses Trinitarian language in Matthew 28:19 when He gives the Great Commission to make disciples and baptize in the name of the Father, Son, and Holy Spirit. The Didache, an early manual of church life, also included the Trinitarian language for baptism. It was written in either the late first or early second century after Christ. We find Trinitarian language again being used by Hippolytus around 200 A.D. in a formula used to question those about to be baptized. New believers were to asked to affirm belief in God the Father, Christ Jesus the Son of God, and the Holy Spirit.

Second, the Roman government didn’t consistently support Trinitarian theology or its ardent apologist, Athanasius. Constantine flip-flopped in his support for Athanasius because he was more concerned about keeping the peace than in theology itself. He exiled Athanasius in 335 and was about to reinstate Arius just prior to his death. During the forty-five years that Athanasius was Bishop of Alexandria in Egypt, he was banished into exile five times by various Roman Emperors.

In fact, later emperors forced an Arian view on the church in a much more direct way than Constantine supported the Trinitarian view. Emperors Constantius II and Julian banished Athanasius and imposed Arianism on the empire. The emperor Constantius is reported to have said, “Let whatsoever I will, be that esteemed a canon,” equating his words with the authority of the church councils.{10} Arians in general “tended to favor direct imperial control of the church.”{11}

Finally, the bishops who attended the Council of Nicea were far too independent and toughened by persecution and martyrdom to give in so easily to a doctrine they didn’t agree with. As we have already mentioned, many of these bishops were banished by emperors supporting the Arian view and yet held on to their convictions. Also, the Council at Constantinople in 381 reaffirmed the Trinitarian position after Constantine died. If the church had temporarily succumbed to Constantine’s influence, it could have rejected the doctrine at this later council.

Possessing the freedom to call an ecumenical council after the Edict of Milan in 313, significant numbers of bishops and church leaders met to consider the different views about the person of Christ and the nature of God. The result was the doctrine of the Trinity that Christians have held and taught for over sixteen centuries.


1. Grudem, Wayne, Bible Doctrine (Zondervan, 1999), p. 104.
2. Blomberg, Craig L., & Robinson, Stephen E., How Wide the Divide, (InterVarsity Press, 1997), p. 128.
3. Bruce McConkie in Mormonism 101 by Bill McKeever & Eric Johnson (Baker Books, 2000), p. 52.
4. Hall, Stuart G., Doctrine and Practice in the Early Church, (Eerdmans, 1991), p. 135.
5. Ibid.
6. Hall, Stuart G., Doctrine and Practice in the Early Church, p. 118.
7. Noll, Mark, Turning Points: Decisive Moments in the History of Christianity, (InterVarsity Press, 1997), p. 51.
8. Ibid., 55.
9. Ibid., 57.
10. Ibid.
11. Ibid., 60.

© 2003 Probe Ministries.

Don Closson served as Director of Administration and a research associate with Probe for 26 years, until taking a position with the same title at the Centers of Church Based Training ( in 2013. He received the B.S. in education from Southern Illinois University, the M.S. in educational administration from Illinois State University, and the M.A. in Biblical Studies from Dallas Theological Seminary. He has served as a public school teacher and administrator before joining Probe and then the CCBT. He is the general editor of Kids, Classrooms, and Contemporary Education.

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