In the name “Biblical Unitarianism”, “Biblical” denotes faith in the Bible; serving to distinguish from Unitarian Universalists, a liberal non-Christian group. “Unitarian” simply refers to the belief that the one God of the Bible is only one person, the Father of the Lord Jesus Christ. A “Biblical Unitarian” then is a Bible-believing Christian who believes that the God of the Bible is one person, the Father of the Lord Jesus Christ, rather than a Trinity of three persons. Biblical Unitarians believe in God, Jesus, and the Holy Spirit, but do not believe that they are all one God; rather, the one God is the Father alone.
Biblical Unitarians note that in the Bible, God is never spoken of as being a Trinity, or as being multiple persons. Rather, they note that all throughout the Bible, God is always spoken of as a single person, indicated by the use of hundreds of singular personal pronouns, and that the one God is expressly equated with the person of the Father alone several times.