Why do christians believes in the trinity?

Answer 1

AnswerThe Holy Trinity has been part of Christian doctrine since at least the fourth century. It is taught as fact by almost all Christian denominations, and for a church member not to believe in the Trinity would be tantamount to denying the authority of his church.

Answer
Christians believe in the Trinity because The Bible teaches the concept.
AnswerBy the third century, Christian leaders were trying to define the divinity of Jesus. One of the issues that concerned them is that if Jesus was divine like God the Father, then Christianity could be regarded as polytheistic, an unacceptable description. A school of thought, now knwn as Trinitarianism, was that God the Father, Jesus and the Holy Spirit were somehow three persons in one - the doctrine now known as the Holy Trinity. The Trinitarian view was opposed by conservatives who held to a Unitarianist view that Jesus was not divine in the same way as God the Father is.

After fierce and sometimes quite personal debate, Trinitarianism was adopted by the Council of Nicaea and incorporated into the Nicene Creed. However, it was not until the end of the fourth century that Emperor Theodosius decreed support for Unitarianism illegal.

Some recent denominations have abandoned the doctrine of the Holy Trinity, but most accept the Holy Trinity of the Nicene Creed.

Answer 2

The trinity doesnt exist in the bible it is never mentioned. certain christians base trinity on one scripture which they have misunderstood. When jesus was getting baptized a voice from heaven in the form of a dove said this is my son so how could jesus be a father and a son aswell it wouldnt make sense?? Therefore trinity was a lie formed by certain christians