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Oak Cliff Bible Fellowship Church
Oakwind
Obaku(3 recs.)
Obeah(9 recs.)
Occidental Orthodox Parishes, Association of(15 recs.)
Oceanic tribal religions
Of a Like Mind
Oglalla Sioux
Ogoni(2 recs.)
Ohio Yearly Meeting of the Society of Friends
Okande
Okinawa Baptist Convention
Old Believers(20 recs.)
Old Believers - Bespopovtsy
Old Believers - Popovtsy
Old Brethren Church(8 recs.)
Old Brethren German Baptist Church(3 recs.)
Old Catholic(7 recs.)
Old Catholic & Polish National Catholic(19 recs.)
Old Catholic Church (Brothers): 2,500 (3 recs.)
Old Catholic Church in North America (Catholicate of the West)(3 recs.)
Old Catholic Church-Utrecht Succession: 900 (9 recs.)
Old Colony Mennonite Church(6 recs.)
Old Episcopal Church
Old German Baptist Brethren: 5,475 (9 recs.)
Old Mennonites
old Missionary Baptists Association(7 recs.)
Old Order (or Yorker) River Brethren(3 recs.)
Old Order (Reidenbach) Mennonites(3 recs.)
Old Order (Wenger) Mennonites
Old Order (Wisler) Mennonite Church: 9,731 (3 recs.)
Old Order Amish Church: 135,000 (193 recs.)
Old Order German Baptist Church: 100 (2 recs.)
Old Order Mennonites(3 recs.)
Old Order River Brethren(5 recs.)
Old Orthodox Catholic Patriarchate of America
Old Regular Baptists(14 recs.)
Old Roman Catholic Church (English Rite)(4 recs.)
Old Roman Catholic Church (English Rite) and the Roman Catholic Church of the Ultrajectine Tradition(3 recs.)
Old Roman Catholic Church (Hamel)(3 recs.)
Old Roman Catholic Church (Shelley/Humphreys)(2 recs.)
Old Roman Catholic Church, Archdiocese of Chicago (Fris)(2 recs.)
Old Roman Church in Canada: 225 (2 recs.)
Old School Amish(2 recs.)
Old School Amish - Yoder
Old School Amish - Zook
Om Sakathi(9 recs.)
Omaha(5 recs.)
Omega 7
Omega Institute
Omoto: 150,000 (7 recs.)
OMS International: 1,000,000
Ona(3 recs.)
Oneida Community(13 recs.)
Oneida Indians
Onge(7 recs.)
Onondaga
Ontake-kyo(4 recs.)
Open Bible Mennonite Church of Guyana
Open Bible Standard Churches: 67,000 (45 recs.)
Operation Rescue
Opus Dei: 76,440 (5 recs.)
Orang Asli
Orange Order
Oraons
Order of Bards, Ovates and Druids: 7,000 (3 recs.)
Order of New Templars(3 recs.)
Order of the Elus-Cohen(3 recs.)
Order of the Holy City
Order of the Nine Angles
Order, The: 40 (4 recs.)
Ordo Lux
Ordo Servorum Isidis(2 recs.)
Ordo Sinistra Vivendi
Ordo Templi Orientis: 3,000 (5 recs.)
Oregon Pagan Association
Organizacion Cristiana Amor Viviente
Orgonomy
Oriental Mission Church
Oriental Orthodox Churches: 36,000,000 (4 recs.)
Oriental Orthodox Churches - not specified
Original Glorious Church of God in Christ Apostolic Faith(4 recs.)
Original Pentecostal Church of God
Original United Holy Church International
Orisha religion
Orlando Christian Center
Oromo(7 recs.)
Orphism(4 recs.)
Orthodox (Eastern Christian): 224,770,000 (138 recs.)
Orthodox (Eastern Christian) - other
Orthodox Catholic Church in America(14 recs.)
Orthodox Catholic Church in America (Verra)(3 recs.)
Orthodox Catholic Church of America (Hyde)(3 recs.)
Orthodox Catholic Church of North and South America
Orthodox Christian Reformed Churches
Orthodox Church in America: 2,000,000 (60 recs.)
Orthodox Church of America
Orthodox Church of Finland(2 recs.)
Orthodox Church of the East(6 recs.)
Orthodox Judaism(27 recs.)
Orthodox Judaism - affiliated(4 recs.)
Orthodox Judaism - attend at least monthly
Orthodox Judaism - attend weekly
Orthodox Judaism - eastern European
Orthodox Judaism - left wing
Orthodox Judaism - major congregations
Orthodox Judaism - right wing
Orthodox Judaism - seminaries for women
Orthodox Presbyterian Church: 19,094 (6 recs.)
Orthodox Reformed Church(2 recs.)
Orthodox Roman Catholic Movement(2 recs.)
Orungu
Osage(6 recs.)
Osh Mari Chi Mari
Ossetians: 564,000 (2 recs.)
Otani(2 recs.)
other: 1,600,000,000 (497 recs.)
other - affiliated(2 recs.)
other - clergy(2 recs.)
Oto(4 recs.)
Ottawa(3 recs.)
Our Lady of Enchantment, Church of the Old Religion: 5,000 (2 recs.)
Our Lady of the Roses, Mary Help of Mothers Shrine
Our Lady of the Sacred Flame
Ovambo(3 recs.)
Overlake Christian Church(2 recs.)
Ovimbundu(3 recs.)