Vatican City is a Christian country.
A Christian state is a country that recognizes a form of Christianity as its official religion and often has a state church , which is a Christian denomination that supports the government and is supported by the government . 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 .