According to a friend who's a Unitarian Universalist and an atheist, you used to be able to describe UU's as people who believe in at most one god. But with many neopagans joining, it's now more accurate to say Unitarians believe in any number of gods from zero to infinity, except three.
"Just because you do not understand something does not mean you can just make something up."
I have no idea who said that other than myself.
Here is my favorite. Sometimes Ayaan Hirsi Ali gets credited with the below quote, but I found it in Hitchen's 'Portable Atheist':
The only position that leaves me with no cognitive dissonance is atheism. It is not a creed. Death is certain, replacing both the siren-song of Paradise and the dread of Hell. Life on this earth, with all its mystery and beauty and pain, is then to be lived far more intensely: we stumble and get up, we are sad, confident, insecure, feel loneliness and joy and love. There is nothing more; but I want nothing more.