Well kiddo, a Universal Pantheist Society is a group of people who have a belief that everything in the universe is connected and it's all one big beautiful thing.
Just like how all the pieces of a puzzle fit together to make a picture, these people believe that everything in the world fits together to make a bigger picture too. They also see the world as a sacred place, and believe that we should treat it with love and respect.
This society welcomes people who believe in different religions, cultures, and beliefs, as long as they share the same basic ideas of connectedness and respect for nature.
So, in short, it's a group of people who believe that everything in the world is connected and should be treated with care and respect.