Indonesia Christian Church
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GKI was established in continuity with the Indonesian Christian Church in West Java, Central Java and East Java. These three denominations were originally independent, each arising from separate missioniary initiatives conducted by local and foreign missionaries. The first of these denominations to be established, later coming to be known as the Indonesian Christian Church East Java, was incorporated on 22 February 1934. Six years later, and coming to be known as the Indonesian Christian Church West Java, the second denomination was incorporated on 24 March 1940. Finally, on 8 August 1945, the Indonesian Christian Churches Central Java was incorporated. Since 27 March 1962, the three denominations have been united as the Indonesian Christian Church, with the overall governing responsibility maintained by the General Synod (Sinode Am), which aims to co-ordinate united efforts towards common goals.
Both GKI West Java and GKI East Java were originally affiliated with the Dutch Hervormd mission, whereas GKI Central Java was affiliated with the Dutch Gereformeerd mission. Additionally, GKI West Java originally included a number of congregations operating as a distinct presbytery, which was affiliated with local and foreign Chinese Evangelical missions. Despite the differences in liturgy and church government between the various congregations and denominations, all the congregation from the three previous GKIs, without exception, consented to the merger at the time GKI united.
GKI's organization consists of congregation, presbytery, regional synod and Synod. Each organization respectively leads by congregation council (session), presbytery council, regional synod council and synod council. As the Synod consists of regional synods, regional synod consists of presbyteries, presbytery consists of congregations, so synod council consists of all regional synod councils, regional synod council consists of all prebytery councils and presbytery council consists of all congregational councils. In short synod council consists of all GKI councils which are composed of elders and ministers.
Church government in congregation runs by executive congregation council, in presbytery runs by executive presbytery council, in regional synod runs by executive regional synod council and in synod runs by executive synod council. This kind of organization acknowledged as presbyterial-Synodal system. What was unique as GKI Presbyterial-Synodal, each form of GKI church organization has its own council as servant-leadership, not merely as an executive board.
The most authoritative forum to make decision in each form of church organization is assembly. The assembly is respective assembly of council in its own scope. The only fact of hierarchi in GKI is the broader scope has more authoritative. The assembly of congregational council has to submit to assembly of presbytery council, assembly of presbytery council has to submit to assembly of regional synod council and assembly of regional synod council has to submit to assembly of synod council.
Regional Synods 
There are three regional synod in GKI: Regional Synod in East Java, Regional Synod in West Java and Regional Synod in Central Java.
in East Java
1.Presbytery of Banyuwangi
2.Presbytery of Bojonegoro
3.Presbytery of Madiun
in West Java
4.Presbytery of Jakarta Barat
5.Presbytery of Jakarta Timur
6.Presbytery of Jakarta Utara
7.Presbytery of Jakarta Selatan
8.Presbytery of Bandung
9.Presbytery of Priangan
10.Presbytery of Cirebon
in Central Java
11.Presbytery of Jakarta I
12.Presbytery of Jakarta II
13.Presbytery of Semarang Barat
14.Presbytery of Semarang Timur
15.Presbytery of Magelang
16.Presbytery of Jogja
17.Presbytery of Solo
18. Presbytery of Purwokerto
Church Functions 
Church functions in GKI are minister and elder. GKI deliberately choosing less number of church functions. Since Elder ( Greek: presbuteros) is a function which GKI believed as being permanent function since the OT to the NT. Whereas minister (Greek: episkopos) is an inheritance function from NT church. However there are a few congregations keeping on the deacon function in their fidelity to old Calvinism.
GKI Liturgy is adapting and referring to Lima Document and BEM Document of WCC. The Word of God ministered by adapting Lectionary (RCL). GKI holds two sacraments, baptism and communion.
Decision Making 
Decision making in each meeting and assembly is undertaken with conciliation method which is parallel to consensus method.
Ecumenical Commitment 
GKI committed to ecumenism by way of become active member of World Council of Churches, World Communion of Reformed Churches, and co-founder of Christian Conference of Asia and Communion of Churches in Indonesia (PGI).
The uniting of GKI has been positioning GKI as the only church unity in the Indonesian ecumenical family, and one of the eight churches in the Asian and one of the eighteen churches in the global ecumenical family which formed united and uniting churches. GKI is undertaking partnership with the Protestant Church in the Netherlands, the Presbyterian Church in the United States of America and the Uniting Church in Australia.
GKI is valuing its theological heritage which originally come from Pietism, Calvinism (both Hervormd and Gereformeerd) and Methodism, but prominently typified as mainline Protestant. GKI is doing theology contextually as a church living in the midst of Muslim community. GKI was deliberately discontinue its ethnic bond (Chinese descendant) as ethnic church to be multi-ethnic national church in 1958. The church affirms the Apostles Creed, Nicene Creed, Athanasian Creed and the Heidelberg Catechism.
- Ramstedt, Martin (2004). Hinduism in Modern Indonesia. Routledge. p. 119. ISBN 978-0-7007-1533-6.