Elaboration
Being non-creedal, Unitarian Universalism does not demand that participants affirm a specific doctrine or creed in order to participate or join. It is radically inclusive and pluralistic, and so welcomes the participation of people of all sorts of religious and philosophical backgrounds and views. This includes (but is not limited to) Jews, Christians, Muslims, Buddhists, pagans, atheists and much more.
Often, Unitarian Universalism and/or Unitaran Universalist are abbreviated "UU." For more information, including far more information about UU history, much is available here.