Romania is a secular state and has no state religion. An overwhelming majority of the population identify themselves as Christians. At the country's 2011 census, 81.0% of respondents identified as Orthodox Christians belonging to the Romanian Orthodox Church. Other denominations include Protestantism (6.2%), Roman Catholicism (4.3%), and Greek Catholicism (0.8%). From the remaining population, 195,569 people belong to other Christian denominations or have another religion, which includes 64,337 Muslims (mostly of Turkish and Tatar ethnicity) and 3,519 Jewish (Jews once constituted 4% of the Romanian population—728,115 persons in the 1930 census). Moreover, 39,660 people have no religion or are atheist, whilst the religion of the rest is unknown.