Religion in Switzerland is predominantly Christianity. According to the national survey of the Swiss Federal Statistical Office, in 2023, Christians accounted for 56% of the resident population (aged fifteen years and older), of whom 30.7% were Catholics, 19.5% were Swiss Protestants, and 5.8% were followers of other Christian denominations (about half Orthodox and half other Protestants). The proportion of Christians has declined significantly since 1980, when they constituted about 94% of the population; during the same timespan, unaffiliated Swiss residents have grown from about 4% to 31% of the population, and people professing non-Christian religions have grown from about 1% to 7.2% of the population. In 2020, according to church registers, 35.2% of the resident population were registered members of the country's Catholic Church, while 23.3% were registered members of the Protestant Church of Switzerland.