The Unitarians

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Unitarian churches are essentially promoted as houses without walls, places were diverse opinions and cultures can converge in safety and without judgment.  But how can churches not have doctrines, specific holy books and/or dogmas?  Does the Unitarian church have merit as a place of respectful discussion on topics relating to belief, purpose and truth?  

What are the colors, cultures, branches, sects and flavors of Universalist churches out there?  

Michael Werner's book "Regaining Balance: the Evolution of the UUA"  http://huumanists.org/store/regaining-balance-evolution-uua