A non-Trinitarian is, by definition (see above), a non-Christian. How do you define "Christian"? There are a number of sects, with significant numbers and inf

A non-Trinitarian is, by definition (see above), a non-Christian. How do you define "Christian"? There are a number of sects, with significant numbers and influence, who call on the name of Jesus (in a "Lord, Lord" way) and they "self-identify" as Christian, and yet they do not share a Christian belief as commonly understood by Christians. Christians have always defined our belief in a particular way. It's fine if sects wish to disbelieve in the Trinity or not use water Baptism, but then they cease to be members of the Church by any stretch of the imagination. These sects include henotheists such as LDS, Arians such as Jehovah's Witnesses, and non-Trinitarians such as Oneness Pentecostals. They all believe themselves to be Christians, but have excluded themselves by definition.