1: A religion where the adherents don't belong to one single religion, and more than likely pulls their beliefs from many different sources.
2: A religion where the adherents come up with their own personal philosophy.
Universal Universalism is an anarchist religion, compared to UUism, a liberal religion. One is not required to be an anarchist to be a Universal Universalist, it's just that the religion doesn't have any political leanings.
The short word for Universal Universalism is UnUnism(pronounced Yoon-Yoonism), due to UUism already being taken.
I don't know what that Universal Universalist believes... He professes some religion called Universal Universalism... Weird...