Mappers by Religion

Catholics

 * Java Sea
 * Chris Mapping
 * ThunderBysk
 * Spyro.con

Orthodox

 * SakhsPro Mapper
 * Percy (IhorPrTV)
 * Redirect

Protestants

 * EmprorCheesecakes
 * Nick HD Mapping (KingOfWeliron)
 * Thunder Mapping
 * Devin HD Mapping
 * Miguelhdzb22
 * TheBronyPenguin
 * Mista Chris

Free Christs

 * Philipp Mapping

Lutheran

 * Mapper Freaker
 * Finn Mapper (Evangelical Lutheran)

Mormons

 * Mapmaker024
 * Perrydoesmapping

Deist

 * TL Mapping
 * TheSuperCanuck
 * KKAP (Agnostic deist)

Sunni

 * SunnyKhan688
 * Lisastr67
 * BatikanBora
 * RedSnakize
 * Jabril and the Arab Mappers
 * OmanGamer
 * Rongong123
 * Numan
 * TheRealCreator902
 * Jeff the Mapper
 * Neonia Mapping

Shia

 * PersiaMaps (disputed)

Atheists (No Religion)

 * Polandball and mapping Slovenia 
 * LennyGeorge
 * Kebab Master Lel
 * Batran99
 * Gaelic Mapping
 * OrangeEmpire
 * FedexWI
 * Polandball421
 * Ceplio
 * Zukas
 * NTR
 * LaksTun
 * IonMapping

Agnostics (No Religion)

 * Claus The Mighty
 * Viper
 * Drex
 * Flaming
 * Olimario
 * KKAP (Agnostic deist)
 * HappyDance (Believes in Witches, Ghosts, Vampires, Spirits, Paranormal, Reincarnation etc)

Gnostic Atheists

 * The Phoenix Mapper

Jewish

 * MrMapperIL
 * EvergreenMapping
 * Monsoonjr99
 * Asdf
 * Jake Mapping
 * Canadian Mapper
 * PillowMapping
 * Elliran (Sraw Rats)

Info
There is a strawpoll that had votes of what religion they are. And right now you can add your self if you like.

http://strawpoll.me/5339111/