Pantheism's basic belief is that all deities in religions are all the same deity, that basically every religion is right, that there is no divine judgement, what is right must be discovered by the individual. Unitarian Universalism is merely a form of worship in all religions could learn from each other by worshipping together. No matter what the religion. So, a Unitarian Universalist religious building will involve people all going in and hearing people preach, with people of other religions and sects, even those who are atheistic or such.
I mean not to criticize, but Ginny Weasly, agnosticism is the "unaffiliated" belief. In which you have not made a choice as an atheist or theist, yet you have a knowledge of a godlike power. Otherwise, with a lack of sufficient knowledge, comes what is called by some "weak atheism" in which atheism comes for ignorance as oppose to denial.