Which Christian church has the largest membership in Finland?

The Evangelical Lutheran Church of Finland (also known as the Church of Finland) has the largest membership in the country.12

While Finland is home to other religious groups, including the Orthodox Church of Finland, the Roman Catholic Church, and various Protestant denominations, the vast majority of the population belongs to the Lutheran church. Historically, the church transitioned from Roman Catholicism to the Lutheran faith during the Protestant Reformation in the 16th century, and it remains a central institution in Finnish society today.12