It has been my experience that EVERY cult has SOME part of the Trinity wrong. The heretic Marcion was excommunicated in 144 due to his proto-orthodox Instead of having a tri-unity among the Persons of the God head, Marcion created a dual, and contradictory pair of Gods, one of the Old Testament, and one of the New Testament, Jesus, with Paul being his most prominent Apostle.
What made Marcion so dangerous is that by taking an approach of using Scriptures to meet his own end, he got to pick and choose, according to his whims what was part of Canon, and what was not Canon. There are several churches and denominations, such as the LDS and the JWs and the "Apostolic churches which are non trinitarians.
Here is a list of some others: from
http://answers.yahoo.com/question/in...1100200AAJHbNJ
* Doukhobors
* Jehovah's Witnesses
* Living Church of God
* Molokan
* Monarchianism
* New Church
* Non-Trinitarian churches
* Oneness Pentecostals
* Polish Brethren
* Socinianism
* Swedenborgianism
* The Church of Jesus Christ of Latter-day Saints
* The Way International
There are more at the site, I just posted some as a reference.
What is interesting is the parallel there is with Marcionism to the Socianian churches, who also reject the Trinity:
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the tenets or doctrines of Faustus Socinus, an Italian theologian of the sixteenth century, who denied the Trinity, the deity of Christ, the personality of the Devil, the native and total depravity of man, the vicarious atonement, and the eternity of future punishment. His theory was, that Christ was a man divinely commissioned, who had no existence before he was conceived by the Virgin Mary; that human sin was the imitation of Adam's sin, and that human salvation was the imitation and adoption of Christ's virtue; that the Bible was to be interpreted by human reason; and that its language was metaphorical, and not to be taken literally
from
http://answers.yahoo.com/question/in...1100200AAJHbNJ.
In each of these cases, there is an underlying arrogance that "We know more than others" but the deceived people on those sorts of churches fail to understand that they are bucking the scholarship of 2000 years and going against what the Bible clearly says about the existence of the Trinity.
If anyone REALLY wants to see how externsive the doctrine is, and is taught in Scripture, I refer them to this list of chapters in the article on Trinity in the International Standard Bible Encyclopedia (ISBE)
1. The Term "Trinity"
2. Purely a Revealed Doctrine
3. No Rational Proof of It
4. Finds Support in Reason
5. Not Clearly Revealed in the Old Testament
6. Prepared for in the Old Testament
7. Presupposed Rather Than Inculcated in the New Testament
8. Revealed in Manifestation of Son and Spirit
9. Implied in the Whole New Testament
10. Conditions the Whole Teaching of Jesus
11. Father and Son in Johannine Discourses
12. Spirit in Johannine Discourses
13. The Baptismal Formula
14. Genuineness of Baptismal Formula
15. Paul's Trinitarianism
16. Conjunction of the Three in Paul
17. Trinitarianism of Other New Testament Writers
18. Variations in Nomenclature
19. Implications of "Son" and "Spirit"
20. The Question of Subordination
21. Witness of the Christian Consciousness
22. Formulation of the Doctrine
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Anyone wanna discuss that with me?