Trinitarianism denotes Christians who believe in the concept of the Trinity. Almost all Christian denominations and churches hold Trinitarian beliefs.

 

       Although the words "Trinity" and "Triune" do not appear in the Bible, theologians, beginning in the 3rd century, developed the term and concept to facilitate comprehension of the New Testament teachings of God as being Father, Son, and Holy Spirit.

 

       Since that time, Christian theologians have been careful to emphasize that Trinity does not imply that there are three gods (the antitrinitarian heresy of Tritheism), nor that each hypostasis of the Trinity is one-third of an infinite God (partialism), nor that the Son and the Holy Spirit are beings created by and subordinate to the Father (Arianism). Rather, the Trinity is defined as one God in three persons.