Appalachian Practices - Regional and Cultural, kept among their own “kind” or within family.
Arbatel Praxis - Open but requires closeness to God/Holy Spirit
Brujeria - Open in and of itself, has closed forms
Buddism - Open, trained monks through lineaged monasteries
Catholism - Open, ordained priesthood
Christianity (Protestant) - Open but may require Baptism and/or Confirmation
Druidry - Original priesthood closed, modern inspired revival open.
Enochian - Open, if you dare.
Faustian Magic - Open
Freemasonry - Requires initiation, Fraternity -- Scottish and York rites require completion of Blue Lodge Degrees
Gnosticism - Open as a whole, some sects were closed.
Golden Dawn, The - Initiation to at least 1=10 for outer order, 5=6 for inner order.
Hellenism - Family and Community oriented, but otherwise open
Heathenry - Depends on tradition, some are culturally closed. --Heathenry includes Asatru and Vanatru
Hoodoo - Open
Islam- Open, but many places requires conversion including but not limited to circumcision.
Judaism - Cultural but not considered closed. Conversion may be required in some sects. Mitvah may also be required. Circumcision may be required.
Hinduism - Adherence open, trained priests under the caste system.
Kabbalah - Jewish Kabbalah closed traditionally, --merged with Hermeticism, Neo-Platonism and Gnosticism which hich open.
Khemetic - Open adherence, original priesthood of city-states was closed
Native American Practices - Culturally Closed
Palo/Las Reglas de Congo - Religion of the Congo in the Americas, culturally closed. --Though closed it is interwoven with Santeria.
Pow -wow/Pen. Dutch - Cultural, generally open, sometimes secretive
Reiki - Closed to the those who have not received attunements.
Santeria - Open. Some sects may be closed.
Shinto - Open, family aspects closed, closed clergy
Solomonic Magic - Open
Strega - Cultural, generally kept within families.
Thelema - The Law is for All; O.T.O and A.A. require initiation.
Voodoo - Closed to non-members of a house
Wica (Gardnerian & Alexandrian - Closed to the Uninitiated.
Wicca (ecletic) - Open
Yoga - Traditionally Lineaged but not treated as closed.
Yoruba - Culturally closed, though there is some blend over African influenced paths.