There is a Christian state called Vatican City.
Christian state . Today , several nations officially identify themselves as Christian states and/or have state churches , including Costa Rica , Denmark , England , Greece , Iceland , Liechtenstein , Monaco , Tonga , Tuvalu , Vatican City , and Zambia . Vatican City ( [ ˈvætᵻkən_ˈsɪti ] Città del Vaticano [ tʃitˈta ddel vatiˈkaːno ] Civitas Vaticana ) , officially Vatican City State or the State of Vatican City ( [ Stato della Città del Vaticano , links = no ] [ Status Civitatis Vaticanae , links = no ] ) , is a walled enclave within the city of Rome .