Title: Orthodox Church of Finland
Content:   When all of Finland became an autonomous Grand Duchy within the Russian Empire in 1809, it already had an established Lutheran Church. Eastern Orthodox Christianity also gained a recognized status in Finland. The old Swedish constitution which Finns generally regarded as the constitution of the Grand Duchy, specifically required that the sovereign was Protestant, but this was overlooked regarding the Orthodox Emperors. In areas where Orthodox faith was not indigenous as in the towns of Helsinki, Tampere and Viipuri and the Karelian Isthmus, Orthodoxy was especially associated with the Russians, most of whom were Russian troops permanently stationed in Finland. 
Title: History of Finland
Content:  During Russian rule, Lutheranism and Eastern Orthodoxy were official religions of the Finnish Grand Duchy. The Evangelical Lutheran Church of Finland was separated from Church of Sweden in the early 1800th century. Immediately after the Finnish War, Finnish Lutheran clergy feared state-led proselytism to Orthodoxy. The majority of Finns were Lutheran Christians, but an ancient prominent Orthodox minority lived in Karelian Isthmus and Ladoga Karelia. The monasteries of Valaam and Konevets were important religious centres and pilgrimage sites of Orthodox faithful. There were also Orthodox churches built in Finnish cities and towns, where there were Russian garrisons. During this period, Roman Catholism, Judaism and Islam came to Finland with Russian soldiers and merchants. While the vast majority of Finns were Lutheran, there were two strains to Lutheranism 
Title: Religion in Finland
Content:  Finland is a predominantly Christian nation where 67.8% of the 5.5 million overall population are members of the Evangelical Lutheran Church of Finland (Protestant), 29.4% are unaffiliated, 1.1% are Orthodox Christians, 0.9% are other christians and 0.8% follow other religions like Islam, Hinduism, Buddhism, Judaism, folk religion etc. There are presently two National churches (as opposed to State churches): the Evangelical Lutheran Church of Finland (Protestant), which is the primary religion representing 67.8% of the population by the end of 2020, and the Finnish Orthodox Church, to which about 1.1% of the population belongs. Those who officially belong to one of the two national churches have part of their taxes turned over to their respective church. There are also approximately 45,000 followers of Pentecostal Christianity, and more than 12,000 Catholic Christians in Finland, along with Anglicans, and some various Independent Christian communities. Prior to its Christianisation, beginning in the 11th century, Finnish paganism was the country's primary religion. The Muslim population in Finland is 2.7% of the total, with about 150,000 adherents in 2016.
Title: Religion in Finland
Content:  The Finnish Orthodox Church (Suomen ortodoksinen kirkko; Finska Ortodoxa Kyrkan), or Orthodox Church of Finland, is an autonomous Eastern Orthodox archdiocese of the Ecumenical Patriarchate of Constantinople. The Church has a legal position as a national church in the country, along with the Evangelical Lutheran Church of Finland. With its roots in the medieval Novgorodian missionary work in Karelia, the Finnish Orthodox Church was a part of the Russian Orthodox Church until 1923. Today the church has three dioceses and 60,000 members that account for 1.1 percent of the native population of Finland. The parish of Helsinki has the most adherents.
Title: Culture of Finland
Content:  Prior to the Christianization of Finland in the 11th-century, Finnish paganism was the primary religion. Song magic and bear worship were distinctive marks of the ancient religion. A contemporary revival of the belief system exists, called suomenusko. Christianity entered Finnish culture in the 12th-century. As in 2016, 72.8% of Finns belong to the Evangelical Lutheran Church and 1.1% belong to the Finnish Orthodox Church.
Title: Orthodox Church of Finland
Content:  The Orthodox Church of Finland (Suomen ortodoksinen kirkko; Ortodoxa kyrkan i Finland; Финляндская Православная церковь ) is an autonomous Eastern Orthodox archdiocese of the Ecumenical Patriarchate of Constantinople. The church has a legal position as a national church in the country, along with the Evangelical Lutheran Church of Finland. With its roots in the medieval Novgorodian missionary work in Karelia, the Orthodox Church of Finland was a part of the Russian Orthodox Church until 1923. Today the church has three dioceses and 58,000 members, accounting for 1.1 percent of the native population of Finland. The parish of Helsinki has the most adherents.
Title: Grand Duchy of Finland
Content:  The Grand Duchy of Finland (Suomen suuriruhtinaskunta; Storfurstendömet Finland; Великое княжество Финляндское, Velikoye knyazhestvo Finlyandskoye, alternatively Grand Principality of Finland) was the predecessor state of modern Finland. It existed between 1809 and 1917 as an autonomous part of the Russian Empire. Originating in the 16th century as a titular grand duchy held by the King of Sweden, the country became autonomous after its annexation by Russia in the Finnish War of 1808–1809. The Grand Duke of Finland was the Romanov Emperor of Russia, represented by the Governor-General. Due to the governmental structure of the Russian Empire and Finnish initiative, the Grand Duchy's autonomy expanded until the end of the 19th century. The Senate of Finland, founded in 1809, became the most important governmental organ and the precursor to the modern Government 
Title: Finns
Content:  in the late 13th century, imposing Roman Catholicism. Reformation in Sweden had the important effect that bishop Mikael Agricola, a student of Martin Luther, introduced written Finnish, and literacy became common during the 18th century. When Finland became independent, it was overwhelmingly Lutheran Protestant. A small number of Eastern Orthodox Finns were also included, thus the Finnish government recognized both religions as "national religions". In 2017 70.9% of the population of Finland belonged to the Evangelical Lutheran Church of Finland, 1.1% to the Finnish Orthodox Church, 1.6% to other religious groups and 26.3% had no religious affiliation. Whereas, in Russian Ingria, there were both Lutheran and Orthodox Finns; the former were identified as Ingrian Finns while the latter were considered Izhorians or Karelians.
Title: Archdiocese of Turku
Content:  Diocese. After the Finnish War in 1809, Finland became a part of the Russian Empire as an autonomous Grand Duchy. In 1817 the Bishop was elevated in the status of Archbishop and thus became the head of the Church in Finland. The Lutheran Church thereby became the state church of the Grand Duchy. In 1870, the church was detached from the state as a separate judicial entity. After Finland had gained independence in 1917, through the constitution of 1919 and the act on religious freedom of 1922 the Evangelical Lutheran Church of Finland became a national church of Finland (along with the Finnish Orthodox Church, which however did not get a constitutional position).
Title: Finland
Content:  church by introducing the Church Act, followed by the Church of Sweden in 2000. Although the church still maintains a special relationship with the state, it is not described as a state religion in the Finnish Constitution or other laws passed by the Finnish Parliament. Finland's state church was the Church of Sweden until 1809. As an autonomous Grand Duchy under Russia 1809–1917, Finland retained the Lutheran State Church system, and a state church separate from Sweden, later named the Evangelical Lutheran Church of Finland, was established. It was detached from the state as a separate judicial entity when the new church law came to force in 

Question: What is the religion of Grand Duchy of Finland?
Answer: Evangelical Lutheran Church of Finland.
Lutheran Church of Finland.
Church of Finland.
Finnish Orthodox Church.
Orthodox Church of Finland.