Welcome to the Barn-Acc
While about 50% of all Barnacles are atheist or agnostic, the remaining 50% follow an established Earth religions. Islam, Christianity (Catholic, Eastern Orthodox, and Protestant), Hinduism, Buddhism, and Judaism are all well-represented.
However, when following these Earth religion, Barnacles tend to have a decidedly mystical bent. Sufism, Kabbalism, and Christian mysticism, esoteric forms of Buddhism are wildly ove-rrepresented (compared to earth populations). Additionally, multiple forms of ancient and modern Paganism, Voudon, Obeyah, and Candomble are well each have enough adherents to form their own cluster.
Finally, there is the group known as the Deep Watchers. These mystics worship the blackness of deep space, and purport to get messages from the universe from the cosmic background radiation, gravity waves, pulsars, quasars, and other esoteric cosmic phenomena.