Nontrinitarianism
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Nontrinitarianism is a form of Christianity that rejects the mainstream Christian doctrine of the Trinity—the teaching that God is three distinct hypostases or persons who are coeternal, coequal, and indivisibly united in one being, or essence (from the Greek ousia). Certain religious groups that emerged during the Protestant Reformation have historically been known as antitrinitarian, but are not considered Protestant in popular discourse due to their nontrinitarian nature. See Being and Existence
According to churches that consider the decisions of ecumenical councils final, Trinitarianism was definitively declared to be Christian doctrine at the 4th-century ecumenical councils, that of the First Council of Nicaea (325), which declared the full divinity of the Son, and the First Council of Constantinople (381), which declared the divinity of the Holy Spirit.

Hear O Israel the Lord Our God the Lord is One

Trinity: Father, Son, and Holy Spirit

The Depiction of Jesus

Virgin Mary
Who is Mary, Mother of Jesus?Chronology
Perspectives on Mary |
Marian dogmas
![]() The veneration of images of Mary is called Marian devotion (Lithuania), a practice questioned in the majority of Protestant Christianity. Mary in Culture |