Like our world, this is one with many religions in constant conflict.
Zoroastrianism
Leaders: Various high preists across various sects.
Principal Dieties: Ormus, Ahriman (some sects consider them to be two personifications of the same god)
Founder: Zarathustra
Holy Book: The Avestas
Holy City: Rhaga, Rasht
Nations: Rasht, Astana, Georgia, Kashka, Tekke, Seleucidia, Mittani, Banghāzī, Mişrātah, Varna, Durrës, Krakow, Yalta, Burgenland, Dalmatia, Helvetica, Ferrara, Italia, Apulia and Sicily.
Asatru
Leader: High Preist of Ubsola
Principal Dieties: Ymir, Odin, Frigg, Freyr, Freya, Thor, Loki, Heimdall, Baldur and The Norns.
Holy Book: The Eddas
Holy City: Ubsola, Örebo
Nations: Örebo, Adger, Sammiland, Turku, Komi, Vologda, Brynask, Cossackia, Memel, Mecklenburg, Arnhem and Thüringen.
Vodun
Leader: Various shamans across belief system.
Principal Deity: Bondjie
Principal Spirits (Loa): Damballa, Ayida Wedo, Guedeh, Barons Samedi, Manman Brigitte, Agwé, Ogoun, Legba, Erzulie, Simbi, Azacca, Loco.
Holy City: Takoradi, Douala
Nations: Douala, Lunsar, Kasamance, Tidjikta, Atouifat, Antafan, Chad, Massai, Zanzibar, Merina, Lisboa, Asturias, Castilla.
Cràbhach
Leader: Various druids, mostly regional.
Principal Deities: Dagda, Morrigan, Belenus, Lugh, Brigit, Tailtu, Macha, Epona, Cu Roi, Goibniu, Cernunnos and Rhiannon.
Nations: Basque, Aquitaine, Entremont, Brabant, Normandie, Moray and Galway.
Cràbhach Cymru
Leader: High Druid King Josef of Wales
Principal Deities: Dagda, Morrigan, Belenus, Lugh, Brigit, Tailtu, Macha, Epona, Cu Roi, Goibniu, Cernunnos, Rhiannon and Josef.
Nations: Wales
Sikhism
Founder: Guru Nanak
Holy Book: Sri Guru Granth Sahib Ji
Holy City: Amritsar
Nations: Punjab, Pasni, Rajkot, Akola, Andhra and Sinhala.
Hinduism
Leaders: Brahmi caste, influential Brahmis include the Brahmis of Benares, Lhasa and Delhi.
Principal Deities: Brahma, Vishnu, Shiva, Saraswathi, Lasshmi, Parvathi, Ganesha, Anjaneya,
Holy Books: Vedas, Mantras, Shivagamas, Purana Itihasas, Gaita and Stotras.
Holy City: Benares
Nations: Nepal, Lhasa, Bengal and Orissa.
Nalonoa
Leader: High Preist of Angkor
Holy Book: Sumber
Holy City: Angkor, Khmer
Nations: Khmer, Mandalay, Thailand, Vietnam, Sanya, Canton and Yunnan.
Shinto
Principal Deities: Izanagi, Izanami, Takagi-no-Kami, Owdatsumi, Oyamatsumi, Amaterasu, Susanowo, Ame-no-Oshihomimi, Toyo-Akitsu, Iwanaga, Konohana, Ninigi, Toyotama, Hoori, Hoderi, Hosuseri, Tamayori, Ugaua-Hukiaezu and Jimmu.
Holy City: Seikyo, Biwa
Nations: Biwa, Anhui, Shandong, Irkutsk, Kwangju, Nakhoda and Ainu.
Pitsiartokti
Principal Deities: Nanook, Akycha, Ignirtoq, Tulugaak, Negafook, Eeyeekalduk, Idliragijenget, Isitoq, Pana, Kadlu, Igaluk, Senda, Atshen, Amaguq, A'akuluujjusi and Latiaran.
Nations: Koryak, Inuitia and Greenland.
Kepercayaan
Leader: High Priest of Prumbanan
Founder: Budi Ramelan
Holy Book(s): Pramana
Holy City: Prumbanan, Yaba
Nations: Yaba, Sianug, Kutai, Mindanao, Kapitau, Udialla and Kalumburu.
Lotu
Leader: Various holy men across island chains.
Principal Deity: Ndengei
Nations: Fiji, Ayr, Honiara and Tahiti.
Hàhi
Leader: High Priest of Wainuiomata
Principal Deities: Io, Pani, Awha, Raa, Arohirohi, Apakura, Paoro, Raka Maomao, Rohe, Whiro, Ua, Papa, Rangi, Ao, Po, Maru, Tawhaki, Ahi,
Holy City: Wainuiomata, Aotearoa
Nations: Aotearoa
Paulele
Leader: Grand Kahuna to the Court of the Ali'i
Holy Book(s): Kumulipo
Holy City: Puuomahuka, Hawai'i
Nations: Hawai'i
Ñan
Principal Deities: Viracocha, Inti, Apocatequil, Ataguchu, Coniraya, Cavillaca, Chasca, Cocomama, Ekkeko, Kon, Pahacamac and Zaramama.
Holy City: Cuzco, Huari
Nations: Huari, Moche and Tiahuanacu.
Ohtli
Principal Deities: Yum Kaax, Chaac, Xaman Ek, Ix Chel, Au Puch and Itzmana.
Holy Books: Ameyalli Codices
Holy City: Tikal, Uxmal
Nations: Uxmal, Achi, Kuna, Amuzgo, Tuxtec, Tanue and Totonac.
Taipa
Leader: High Priest of Muir
Founder: Kyoi Huyana
Holy Book: The Huata
Holy City: Muir, Cahuilla
Nations: Cahuilla, Miwok, Tutuni and Skagit.
Meo'o
Founder: Wananikwe
Leader: Various regional and national yuwipi or holy men.
Principal Deities: Skab, Haokah, Iya, Wi, Whope and Ictinike.
Nations: Cheyenne, Arapaho, Karankawa, Osage, Sioux and Cree.
Rahahiyo
Leader: Various holy men, regional.
Founder: Kíwakwëniyustha
Holy Book: Kimi
Nations: Delaware, Huron, Miami, Cherokee, Napochi, Caddo and Quapaw.
Veyanuna
Leader: High Priest of Saumatre
Holy Book: Fotuto
Holy City: Saumatre, Caribia
Nations: Caribia, Arawak, Seminole, Guale, Chawasha, Chibcha, Mabarumba and Tupi.
Map of the World's Religions:
http://www.civfanatics.net/uploads8/plxnes5wrldmap-religions-1c.png