Most Unitarian Universalist congregations have RE or Religious Education or Sunday School for children and frequently for adults. For an overview please visit the Unitarian Universalist Association of Congregations webpage on RE at: http://www.uua.org/re/
Since each congregation sets up it's own RE program you will need to visit that congregation's website and facilities to find out about their current RE programs.
Typical Sunday School curricula explore major themes such as: Unitarian Universalist Identity, World Religions, Social Justice, Judeo-Christian Heritage, and Spiritual Self Development.
For Children's Faith Development visit the UUA's webpage: http://www.uua.org/re/children/index.shtml
For Youth Ministry visit the UUA's webpage: http://www.uua.org/re/youth/index.shtml