Orthodox Church. Orthodox Christianity, together with Islam, Buddhism, and Paganism (either preserved or revived), are recognised by Russian law as the traditional religions of the country, part of its "historical heritage". The amendments of 2020 to the constitution added, in the Article 67, the continuity of the Russian state in history based on preserving "the memory of the ancestors" and general "ideals and belief in God" which the ancestors conveyed. After the collapse of the Soviet Union, there was a renewal of religions in Russia, with the revival of the traditional faiths and the emergence of new forms within the traditional faiths as well as many new religious movements. Islam is the second-largest religion in Russia, and is the traditional religion among the majority of the peoples of the North Caucasus, and among some Turkic peoples scattered along the Volga-Ural region. Large populations of Buddhists are found in Kalmykia, Buryatia, Zabaykalsky Krai, and they are the vast majority of the population in Tuva. Many Russians practise other religions, including Rodnovery (Slavic Neopaganism), Assianism (Scythian Neopaganism), other ethnic Paganisms, and inter-Pagan movements such as Ringing Cedars' Anastasianism, various movements of Hinduism, Siberian shamanism and Tengrism, various Neo-Theosophical movements such as Roerichism, and other faiths. Some religious minorities have faced oppression and some have been banned in the country; notably, in 2017 the Jehovah's Witnesses were outlawed in Russia, facing persecution ever since, after having been declared an "extremist" and "nontraditional" faith. In 2012, the research organisation Sreda, in cooperation with the Ministry of Justice, published the Arena Atlas, an adjunct to the 2010 census, enumerating in detail the religious populations and nationalities of Russia, based on a large-sample country-wide survey. The results showed that 47.3% of Russians declared themselves Christians — including 41% Russian Orthodox, 1.5% simply Orthodox or members of non-Russian Orthodox churches, 4.1% unaffiliated Christians, and less than 1% Old Believers, Catholics or Protestants — 25% were believers without affiliation to any specific religion, 13% were atheists, 6.5% were Muslims, 1.2% were followers of "traditional religions honouring gods and ancestors" (Rodnovery, other Paganisms, Siberian shamanism and Tengrism), 0.5% were Buddhists, 0.1% were religious Jews and 0.1% were Hindus. Education Russia has an adult literacy rate of 100%, and has compulsory education for a duration of 11 years, exclusively for children aged 7 to 17–18. It grants free education to its citizens by constitution. The Ministry of Education of Russia