There are a variety of current-day and historical doctrines and movements which are collectively referred to as [Non-Trinitarian][1].  Non-trinitarian beliefs vary greatly, but they are all considered to be contradictory to the traditionally orthodox teachings of Trinitarian doctrine.

Some common non-trinitarian doctrines are:

 * [Arianism][2] - Jesus is the first and greatest creation of the Father.
 * [Adoptionism][3] - Jesus was a human being who was adopted by the Father at some point after birth (typically at His baptism).
 * [Sabellianism (Modalism)][4] - The Father, the Son, and the Holy Spirit are three different manifestations of the same being.
 * [Socinianism][5] - Jesus was the Son of God from birth, but did not exist before He was born.

Some popular Non-Trinitarian denominations and movements are:

 * [Christadelphians][6]
 * [Jehovah's Witnesses][7]
 * [The Church of Jesus Christ of Latter-day Saints][8]
 * [Oneness Pentacostalism][9]
 * [Unitarianism][10]
 


  [1]: http://en.wikipedia.org/wiki/Nontrinitarianism
  [2]: http://en.wikipedia.org/wiki/Arianism
  [3]: http://en.wikipedia.org/wiki/Adoptionism
  [4]: http://en.wikipedia.org/wiki/Sabellianism
  [5]: http://en.wikipedia.org/wiki/Socinianism
  [6]: http://en.wikipedia.org/wiki/Christadelphians
  [7]: http://en.wikipedia.org/wiki/Jehovah%27s_Witnesses
  [8]: http://en.wikipedia.org/wiki/The_Church_of_Jesus_Christ_of_Latter-day_Saints
  [9]: http://en.wikipedia.org/wiki/Oneness_Pentecostalism
  [10]: http://en.wikipedia.org/wiki/Unitarianism