Some speculate ancient go boards were used for divination.
Go is so old that it certainly has dogma and tradition, as many religions do. Go players spend more time playing go than many "religious" people go to church (daily, not weekly)
Go Clubs are houses of worship, and our best players (pros) are clergy. The devout students study the works of the clergy...
Go is so sublime that it is surely mystical
"Go is just a game. However, the nature of the game allows it to provide a window into everyday situations. The choices made in a simple game turn out to be deeply representative of one's true character. When I play go, I am offered a window into another's complete spirit, and my own nature becomes transparent."
-- Jesse Chao, from AGA-EJ Volume 5, #62
Before you ask yes I am Buddhist, but not of this branch.