Article: Another major group, inhabitants who follow Eastern Orthodox Christianity, practised chiefly by the Russian minority, and the Russian Orthodox Church is the second largest denomination with 150,000 members. The Estonian Apostolic Orthodox Church, under the Greek-Orthodox Ecumenical Patriarchate, claims another 20,000 members. Thus, the number of adherents of Lutheranism and Orthodoxy, without regard to citizenship or ethnicity, is roughly equal. Refer to the Table below. The Catholics have their Latin Apostolic Administration of Estonia.

Question: Which religious group is the second largest with 150,000 members?
the Russian Orthodox Church