Trinity

The traditional view of God that has been held by Christians for the last 2,000 years is that he exists as three persons, Father, Son and Holy Spirit— not that there are three separate Gods, nor that he is one God wearing three different hats (traditionally called Modalism)—but that there is only one God who exists as three distinct Persons. This view has its roots in the Bible and was spelled out in credal form by the church of the fourth century.