Well, there are seven formal UU values:

*The inherent worth and dignity of every person;

*justice, equity and compassion in human relations;

*world peace, liberty and justice for all; and

*respect for the interdependent web of all existence.

*Acceptance of one another and encouragement to spiritual growth in our congregations;

*a free and responsible search for truth and meaning; and

*the right of conscience and the use of the democratic process within our congregation and in society at large.

I would consider the first four to be values that are roughly shared with LessWrong, although there are definitely some differences in perspective. The fifth one, UUs focus on spiritual growth, LW focuses on growing rationality. The sixth principle is again shared. The seventh seems implemented in the LessWrong karma system, and I'd actually say LW does better here than the UUs.

It's also worth noting that these are explicitly "shared values", and not a creed. The general attitude I have seen is that one should show respect and tolerance even to people who don't share these values.

LessWrong is a place for rationalists to meet and discuss rationality. UU Churches are a place for UUs to meet and discuss their shared values. It doesn't serve LessWrong to have it dominated by "religion vs rationality" posts, nor posts trying to sell Christianity or de-convert rationalists. It doesn't serve the UUs to have church dominated by challenges to those values.