Basics of Unitarianism:

Synonyms for Unitarianism: Relativism, Emergents, The Emergent Church

It should be noted that, more than any other religion, Unitarian Universalism has an impact on the laws and culture of the United States and Canada.

The main precept of Unitarianism is Relativism, so any other precepts are merely trends or indications of how the majority of Unitarians are thinking. 

Most Unitarians reject the Trinity.

The don’t accept Jesus as God, but some see Him as a prophet of God.

Originally, there was a predominant belief in monotheism.  That was replaced by humanism—human is god. The trend is now toward New Age, Neo-paganism and radical Feminism.

Unitarian Universalists tend to filter Scripture through reason (rationalism), scholarship (intellectualism), science (naturalism, materialism, and uniformitarianism), and philosophy (rationalism).

Unitarians promote secularism as a state religion, and secular schools were started by a Unitarian as a way to assure that children would not be taught Christian principles.

Unitarianism is both an organization and a meandering theological belief that is adopted my other organizations.

Socinianism, Arianism are types of Unitarianism.

Jehovah's Witnesses and Christadelphians have Unitarian theology.

Basic Tenets of Biblical Christianity:  

To compare Unitarian Universalism to Biblical Christianity, go here.