In most branches of ChristianChristianity, the Trinity is an entity consisting of God (the Father), Jesus Christ (the Son), and the Holy Spirit. Sometimes called the "Triume Godhead," most Christians do not consider the Trinity to be a Pantheon, as you would find in many polytheistic religions, but as "three persons in one God." This allows Christians to claim that they follow a monotheistic religion, while in essence worshipping three gods. The composition and nature of the Trinity has been a major topic of disagreement and confusion among Christians since it was adopted at the Council of Nicea in 325 C.E.
The Trinity is never mentioned by that name in the Bible. While God, Jesus, and the Holy Spirit are all mentioned separately throughout the New Testament, there is only one passage which provides support for Trinitarian doctrine: 1 John 5:7-8 , which scholars call the Johannine Comma.
Not all Christian denominations accept the doctrine of the Trinity.