Interesting you dont think agnosticism is truly accepted  Ive always thought of UU liturgy as being a sort of organized agnosticism  Perhaps you meant atheism but there are several prominent atheist ministers in the UUA so Im not sure you can even say that atheism isnt accepted  When I joined my first UU congregation I was handed an envelope full of UUApublished pamphlets on various paths in UU such as Buddhism liberal Christianity neoPaganism and atheism  Individual UUs may not be agnostic but the denomination as a whole seems to meet that definition  I dont think Ive ever heard the sentiment it doesnt matter what you believe so long as you believe something which I suppose could lead to a denomination being agnostic as a whole but disapproving of individual agnostics  I think agnosticism in terms of recognizing that no one path is necessary the truth is an important part of UUism