Adoptionism, sometimes called dynamic monarchianism

Monarchianism

Monarchianism is a set of beliefs that emphasize God as being one person. The term was given to Christians who upheld the "monarchy" of God against the Logos theology of Justin Martyr and apologists who had spoken of Jesus as a second divine person begotten by God the Father before the creation of...

, is a minority Christian belief that Jesus was adopted as God's son (Son of God

Son of God

"Son of God" is a phrase which according to most Christian denominations, Trinitarian in belief, refers to the relationship between Jesus and God, specifically as "God the Son"...

) at his baptism

Baptism of Jesus

The baptism of Jesus marks the beginning of Jesus Christ's public ministry. This event is recorded in the Canonical Gospels of Matthew, Mark and Luke. In John 1:29-33 rather than a direct narrative, the Baptist bears witness to the episode...

. According to Epiphanius

Epiphanius of Salamis

Epiphanius of Salamis was bishop of Salamis at the end of the 4th century. He is considered a saint and a Church Father by both the Eastern Orthodox and Catholic Churches. He gained a reputation as a strong defender of orthodoxy...

's account of the Ebionites

Ebionites

Ebionites, or Ebionaioi, , is a patristic term referring to a Jewish Christian sect or sects that existed during the first centuries of the Christian Era. They regarded Jesus as the Messiah and insisted on the necessity of following Jewish religious law and rites...

, the group believed that Jesus was chosen because of his sinless devotion to the will of God.

Adoptionism was declared heresy at the end of the 2nd century and was rejected by the First Council of Nicaea

First Council of Nicaea

The First Council of Nicaea was a council of Christian bishops convened in Nicaea in Bithynia by the Roman Emperor Constantine I in AD 325...

, which held to the orthodox doctrine

Orthodoxy

The word orthodox, from Greek orthos + doxa , is generally used to mean the adherence to accepted norms, more specifically to creeds, especially in religion...

 of the Trinity

Trinity

The Christian doctrine of the Trinity defines God as three divine persons : the Father, the Son , and the Holy Spirit. The three persons are distinct yet coexist in unity, and are co-equal, co-eternal and consubstantial . Put another way, the three persons of the Trinity are of one being...

, identifying Jesus as eternally begotten of God

Nicene Creed

The Nicene Creed is the creed or profession of faith that is most widely used in Christian liturgy. It is called Nicene because, in its original form, it was adopted in the city of Nicaea by the first ecumenical council, which met there in the year 325.The Nicene Creed has been normative to the...

.

Some scholars see Adoptionist concepts in the Gospel of Mark

Gospel of Mark

The Gospel According to Mark , commonly shortened to the Gospel of Mark or simply Mark, is the second book of the New Testament. This canonical account of the life of Jesus of Nazareth is one of the three synoptic gospels. It was thought to be an epitome, which accounts for its place as the second...

 and in the writings of the Apostle Paul.