Statistik Umat Menurut Agama di Indonesia. Kementerian Agama Republik Indonesia. 2018-05-15 [2020-11-15]. (原始内容存档于3 September 2020) (印度尼西亚语). Muslim 231.069.932 (86.7), Christian 20.246.267 (7.6), Catholic 8.325.339 (3.12), Hindu 4.646.357 (1.74), Buddhist 2.062.150 (0.77), Confucianism 71.999 (0.03), Others/Traditional faiths 112.792 (0.04), Total 266.534.836
Aritonang, Jan Sihar; Steenbrink, Karel (编), A history of Christianity in Indonesia, Leiden, The Netherlands: Koninklijke Brill NV: 647, 2008 [2010-11-30], ISBN 978-90-04-17026-1, (原始内容存档于2023-08-02), Protestants--European or Indonesian--living in the major cities mostly belonged to the Protestant Church in the Dutch East Indies, the Indische Kerk. The status of this church was in some respects quite different from that of the Catholic community, because it was placed more directly under government authority. By a decree of 11 December 1835 the Dutch king, Willem I, commanded the fusion of the Lutheran and Reformed denominations (only effected in 1854), and the establishment of one church council for the whole colony (realised in 1844).
Aritonang, Jan Sihar; Steenbrink, Karel (编), A history of Christianity in Indonesia, Leiden, The Netherlands: Koninklijke Brill NV: 617, 2008 [2010-11-30], ISBN 978-90-04-17026-1, (原始内容存档于2023-08-02), It is remarkable that in the merger of the BKP with the BNKP the choice for unification was made on cultural rather than denominational grounds. While the Batunese congregations show distinctly Lutheran traits, especially in liturgical matters, the sense of communion is determined by ethno-cultural relations. Similar language and customary law, and especially family links between Nias and the Batu Islands, by far outweigh eccliastical tradition.