Unitarianism should be understood vis a vis unitarian-universalism. While Unitarianism is still attached to Christianity, Unitarian-Universalism positions itself as a new religion that is detached from its Christian roots.
Unitarianism is primarily an openness to a plural world, a diverse world, and a genuine curiosity to all beliefs and perspectives. A unitian’s commitment to a certain belief is not more than his commitment to the possibility of a plural, free society.
References
Brown, A. J. (2007, August 8). Welcome to the New Blog. Caute. http://andrewjbrown.blogspot.com/2007/08/welcome-to-new-blog.html
Unitarianism these days is characterised more as a method of working out one’s faith and belief than a coherent set of beliefs.
each Unitarian has a duty to formulate his or her own view and be willing to express that view.
But does our way of worship actually enable individuals to share their beliefs with others or listen to their views and experiences? Are we too dependent on our ministers, preachers and worship leaders?
how much diversity of belief about God is there within Cambridge Unitarian Church? What about allowing people to write down their thoughts and perhaps expain them briefly to the congregation?
we should look at the experiences of other churches who have a non credal basis ( e.g. the Quakers)or sit lightly to creeds (e.g. the UCC in America).
It has always seemed to me that the liberalism and openness of a church such as the Cambridge one consists in actively supporting the maintenance of a wider liberal intellectual and social space (in our case the secular state) in which the kind of diversity and discussion you call for is not only allowed but encouraged.
The trick, it seems to me, is how to remain able to live a coherent and modern Christian faith that has a non-credal basis and/or one which “sits lightly to creeds.” As you rightly say we do need to ask what we can learn from the Quakers or the United Church of Christ (UCC) on this matter.