HolyTrinity

Historically, as evidenced by the Nicene and Apostle's Creeds used by most of Christianity, the Holy Trinity refers to what Christians say are the three aspects of God, the Father, the Son, and the Holy Spirit.

The Father is the God who acts throughout the Old Testament and talks to Christ in the New Testament.

The Son is Jesus, whose sacrifice on the cross ransomed souls from hell, opened the portal to heaven for those who want to go or both, depending on which Christian tradition one consults. He was both God and man, not considered to be some kind of phantasm or soulless possessed being, but was just like other humans except for also being God.

The Holy Spirit is the essence of God embodied as divine or inspired wisdom in people's lives, telling them the proper way to deal with the universe. It is within everyone, the part of God that communicates directly with humans.

The three parts of the Holy Trinity are widely held to be coeternal, of the same substance, and yet inexplicably different. All are considered to be present at each stage in history; the Trinity just shows the appropriate character at a given point.