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Abstract
The C5 category of the Insider Movement (IM-C5) has sparked ecclesiological debates because it allows followers of Christ from non-Christian religious backgrounds to retain their socio-religious identity while acknowledging Jesus as Savior. This approach is often considered strategic for reaching communities resistant to conventional evangelistic methods, but it also raises serious concerns regarding church boundaries, sacramentology, and doctrinal authority. From a Reformed theological perspective, the church is understood as a community established by the Word and the sacraments; therefore, any form of contextualization must remain consistent with Scripture and ecclesiological principles. This study aims to assess the theological implications of IM-C5 for the identity of the church within the Reformed framework. To address this issue, the research utilizes a qualitative, analytical-descriptive approach that includes library research and a systematic review of both primary and secondary literature. The findings indicate that, although IM-C5 holds strategic value in mission, its practice risks obscuring the identity of the church, weakening the understanding of the sacraments, and relativizing doctrinal authority. The main contribution of this study is the development of an evaluative rubric based on Reformed ecclesiology, which can be used to consistently assess contextualization strategies at both academic and practical levels.
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References
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- Belcher, K. (2020). Sacramental Exchange: Eschatological Economy and Consumption Ritual. Religions, 11(11), 13–14. https://doi.org/10.3390/rel11110586
- Boas, S. V. (2024). The Importance of the Nicean Creed for Christian Identity: A Theological–Pastoral Reading from the Philosophy of Austin and Lakatos. Religions: An Open Access Journal of Theology, Philosophy, and Religious Studies, 15(4), 3.
- Calvin, J. (n.d.). The Institutes of the Christian Religion (T. by H. Beveridge (Ed.)). Grand Rapids, MI: Eerdmans.
- Garner, D. B. (2016). Pertaruhan Penting: Hermeneutika Insider Movement dan Injil. Verbum Christi: Jurnal Teologi Reformed Injili, 3(2), 177–178.
- Gijsbert van den Brink. (2020). The Oxford Handbook of Reformed Theology. Oxford University Press. https://doi.org/10.1093/oxfordhb/9780198723912.013.24
- Greenham, A. S. I. dan A. (2018a). Muslim Conversions to Christ: A Critique of Insider Movements in Islamic Contexts. International Academic Publishers.
- Greenham, A. S. I. dan A. (2018b). Muslim Conversions to Christ: A Critique of Insider Movements in Islamic Contexts. International Academic Publishers.
- H. Russell Bernard, Amber Wutich, G. W. R. (2017). Analyzing Qualitative Data: Systematic Approaches. SAGE Publications.
- Hans Burger, Arnold Huijgen, D., & Peels, E. (2018). Sola Scriptura : Biblical and Theological Perspectives on Scripture, Authority, and Hermeneutics. Brill.
- Higgins, K. (2004). The Key to Insider Movements: The ‘Devoteds’ of Acts. International Journal of Frontier Missiology, 21(4), 157–158.
- Hudaya, N. (2021). Imamat Am Orang Percaya dan Relevansinya bagi Pengembangan Misi dalam Konteks Pluralisme di Indonesia. TE DEUM: Jurnal Teologi Dan Pengembangan Pelayanan, 11(1), 7–8.
- Hutagalung, P. (2020). Keterlibatan Jemaat dalam Disiplin Gereja Berdasarkan Matius 18:15-20. Fidei: Jurnal Teologi Sistematika Dan Praktika, 3(1), 127–128.
- Ji, B. Y. and Q. (2023). In Communionwith God”: The Inculturation of the Christian Liturgical Theology of Giulio Aleni in His Explication of the Mass (Misa Jiyi). Religions, 14(1255), 2–4. https://doi.org/https://doi.org/ 10.3390/rel14101255
- Joas Adiprasetya. (2023). Berhimpun dan Tersebar: Menimbang Dua Model Eklesiologi. DIEGESIS: Jurnal Teologi, 8(2), 132–133.
- Kevin Tony Rey, Singgih Prastawa, E. S. (2024). Epistemologi Dan Hermeneutika Teologis Dalam Tradisi Four Square: Sebuah Kajian Rasionalitas Pentakosta. Journal of International Multidisciplinary Research, 2(6), 87. https://journal.banjaresepacific.com/index.php/jimr %0A
- Kristanto, B. (2017). Reformasi, Calvin, dan Perjamuan Kudus. Verbum Christi: Jurnal Teologi Reformed Injili, 4(2), 180–181.
- Langås, A. (2021). Towards a Missional Ecclesiology: A Prospective Issue for a Danish Missiological Journal? Norwegian Journal of Missiology, 75(3), 177–178.
- Matthew A. Bennett. (2020). Muslim Insider Ecclesiology: Does Insider Movement Contextualization Produce Biblically Faithful Churches or a Mere Mosquerade? The Journal of Global Christianity, 6(1), 42–43.
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- Mostain, H. El. (2023b). A Missiological Assessment of the Insider Movement. Foundations: An International Journal of Evangelical Theology, 83(3), 54–55.
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- Paulus Purwarto, Suhadi, P. K. B. (2022). Peranan Alkitab Sebagai Otoritas Tertinggi dan Aplikasinya Dalam Misi Gereja Masa Kini. Jurnal Teologi Berita Hidup, 5(1), 192–193.
- Purnama, L. dan F. (2024). Martir: Kesaksian Akhir Hidup Para Murid Yesusdalam Pemberitaan Injil pada Awal Kekristenandan Implikasinya bagi Penginjil di Masa Kini. YADA: JURNAL TEOLOGI BIBLIKA & REFORMASI, 2(2), 7.
- Richard Doss. (2019). Insider Movements Among Muslims: Reflections on Their History, Identity, and Theology. Journal of Adventist Mission Studies, 14(1), 92.
- Seckler, T. W. (2018). Majority World Theologizing: Muslim background believer perspectives regarding insider movements. Missiology: An International Review, 46(1), 94.
- Setiawan, D. E. (2020). Menjembatani Injil dan Budaya dalam Misi Melalui Metode Kontektualisasi. Fidei: Jurnal Teologi Sistematika Dan Praktika, 3(2), 177.
- Smalley, J. R. B. & P. M. (2024). Reformed Systematic Theology, Volume 4: Church and Last Things. Crossway.
- Sunarko, A. S. (2022). Implementasi Doktrin Sola Scriptura dalam Pertumbuhan Iman Jemaat Gereja Masa Kini. Lentera Nusantara: Jurnal Teologi Dan Pendidikan Agama Kristen, 2(1), 155–156. https://jurnal.sttkn.ac.id/index.php/JL/index
- Tennent, T. C. (2006). Followers of Jesus (Isa) in Islamic Mosques: A Closer Examination of C-5 ‘High Spectrum’ Contextualization. International Journal of Frontier Missiology, 23(3), 109.
- The Belgic Confession. (n.d.). Grand Rapids, MI: Christian Reformed Church in North America. https://www.crcna.org/welcome/beliefs/confessions/belgic-confession
- The Westminster Confession of Faith. (n.d.). Grand Rapids, MI: Puritan Reformed Theological Seminary. https://prts.edu/wp-content/uploads/2016/12/Westminster_Confession.pdf
- Tohatta, D. (2023). Holy Communion as Inclusive Space of Encounter for People with Disabilities. Indonesian Journal of Theology, 11(2), 375. https://doi.org/https://doi.org/10.46567/ijt.v11i2.391
- Travis, H. T. & J. (2015). Understanding insider movements: Disciples of Jesus within diverse religious communities. CA: William Carey Library.
- Travis, H. T. dan J. J. (2015). Understanding Insider Movements: Disciples of Jesus within Diverse Religious Communities. William Carey Library.
- Travis, J. (2000). Messianic Muslim Followers of Isa: A Closer Look at C5 Believers and Congregations. International Journal of Frontier Missions, 17(1), 54.
- Trueman, C. R. (2018). The Creedal Imperative. Crossway.
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References
Barry J. York. (2022). The Sacraments as a Mark of the Church. Reformed Presbyterian Theological Journal, 9(1), 5.
Belcher, K. (2020). Sacramental Exchange: Eschatological Economy and Consumption Ritual. Religions, 11(11), 13–14. https://doi.org/10.3390/rel11110586
Boas, S. V. (2024). The Importance of the Nicean Creed for Christian Identity: A Theological–Pastoral Reading from the Philosophy of Austin and Lakatos. Religions: An Open Access Journal of Theology, Philosophy, and Religious Studies, 15(4), 3.
Calvin, J. (n.d.). The Institutes of the Christian Religion (T. by H. Beveridge (Ed.)). Grand Rapids, MI: Eerdmans.
Garner, D. B. (2016). Pertaruhan Penting: Hermeneutika Insider Movement dan Injil. Verbum Christi: Jurnal Teologi Reformed Injili, 3(2), 177–178.
Gijsbert van den Brink. (2020). The Oxford Handbook of Reformed Theology. Oxford University Press. https://doi.org/10.1093/oxfordhb/9780198723912.013.24
Greenham, A. S. I. dan A. (2018a). Muslim Conversions to Christ: A Critique of Insider Movements in Islamic Contexts. International Academic Publishers.
Greenham, A. S. I. dan A. (2018b). Muslim Conversions to Christ: A Critique of Insider Movements in Islamic Contexts. International Academic Publishers.
H. Russell Bernard, Amber Wutich, G. W. R. (2017). Analyzing Qualitative Data: Systematic Approaches. SAGE Publications.
Hans Burger, Arnold Huijgen, D., & Peels, E. (2018). Sola Scriptura : Biblical and Theological Perspectives on Scripture, Authority, and Hermeneutics. Brill.
Higgins, K. (2004). The Key to Insider Movements: The ‘Devoteds’ of Acts. International Journal of Frontier Missiology, 21(4), 157–158.
Hudaya, N. (2021). Imamat Am Orang Percaya dan Relevansinya bagi Pengembangan Misi dalam Konteks Pluralisme di Indonesia. TE DEUM: Jurnal Teologi Dan Pengembangan Pelayanan, 11(1), 7–8.
Hutagalung, P. (2020). Keterlibatan Jemaat dalam Disiplin Gereja Berdasarkan Matius 18:15-20. Fidei: Jurnal Teologi Sistematika Dan Praktika, 3(1), 127–128.
Ji, B. Y. and Q. (2023). In Communionwith God”: The Inculturation of the Christian Liturgical Theology of Giulio Aleni in His Explication of the Mass (Misa Jiyi). Religions, 14(1255), 2–4. https://doi.org/https://doi.org/ 10.3390/rel14101255
Joas Adiprasetya. (2023). Berhimpun dan Tersebar: Menimbang Dua Model Eklesiologi. DIEGESIS: Jurnal Teologi, 8(2), 132–133.
Kevin Tony Rey, Singgih Prastawa, E. S. (2024). Epistemologi Dan Hermeneutika Teologis Dalam Tradisi Four Square: Sebuah Kajian Rasionalitas Pentakosta. Journal of International Multidisciplinary Research, 2(6), 87. https://journal.banjaresepacific.com/index.php/jimr %0A
Kristanto, B. (2017). Reformasi, Calvin, dan Perjamuan Kudus. Verbum Christi: Jurnal Teologi Reformed Injili, 4(2), 180–181.
Langås, A. (2021). Towards a Missional Ecclesiology: A Prospective Issue for a Danish Missiological Journal? Norwegian Journal of Missiology, 75(3), 177–178.
Matthew A. Bennett. (2020). Muslim Insider Ecclesiology: Does Insider Movement Contextualization Produce Biblically Faithful Churches or a Mere Mosquerade? The Journal of Global Christianity, 6(1), 42–43.
Mostain, H. El. (2023a). A Missiological Assessment of the Insider Movement. Foundations: An International Journal of Evangelical Theology, 83(3), 47–48.
Mostain, H. El. (2023b). A Missiological Assessment of the Insider Movement. Foundations: An International Journal of Evangelical Theology, 83(3), 54–55.
Mowat, J. S. & H. (2016). Practical Theology and Qualitative Research (Second Edition). SCM Press.
Olevianus, Z. U. dan C. (n.d.). Katekismus Heidelberg.
Pakpahan, B. J. (2022). Analisis teologis dan historis pemahaman tohonan sebagai jabatan dan ordinasi di Huria Kristen Batak Protestan. Kurios: Jurnal Teologi Dan Pendidikan Agama Kristen, 8(2), 432. https://doi.org/https://doi.org/10.30995/ kur.v8i2.570
Pattianakotta, H. A. (2021). Menjadi Jemaat Publik: Menggereja secara Misional, Relasional, dan Inkarnasional di Ruang Publik. Theologia in Loco, 3(1), 13–14.
Paulus Purwarto, Suhadi, P. K. B. (2022). Peranan Alkitab Sebagai Otoritas Tertinggi dan Aplikasinya Dalam Misi Gereja Masa Kini. Jurnal Teologi Berita Hidup, 5(1), 192–193.
Purnama, L. dan F. (2024). Martir: Kesaksian Akhir Hidup Para Murid Yesusdalam Pemberitaan Injil pada Awal Kekristenandan Implikasinya bagi Penginjil di Masa Kini. YADA: JURNAL TEOLOGI BIBLIKA & REFORMASI, 2(2), 7.
Richard Doss. (2019). Insider Movements Among Muslims: Reflections on Their History, Identity, and Theology. Journal of Adventist Mission Studies, 14(1), 92.
Seckler, T. W. (2018). Majority World Theologizing: Muslim background believer perspectives regarding insider movements. Missiology: An International Review, 46(1), 94.
Setiawan, D. E. (2020). Menjembatani Injil dan Budaya dalam Misi Melalui Metode Kontektualisasi. Fidei: Jurnal Teologi Sistematika Dan Praktika, 3(2), 177.
Smalley, J. R. B. & P. M. (2024). Reformed Systematic Theology, Volume 4: Church and Last Things. Crossway.
Sunarko, A. S. (2022). Implementasi Doktrin Sola Scriptura dalam Pertumbuhan Iman Jemaat Gereja Masa Kini. Lentera Nusantara: Jurnal Teologi Dan Pendidikan Agama Kristen, 2(1), 155–156. https://jurnal.sttkn.ac.id/index.php/JL/index
Tennent, T. C. (2006). Followers of Jesus (Isa) in Islamic Mosques: A Closer Examination of C-5 ‘High Spectrum’ Contextualization. International Journal of Frontier Missiology, 23(3), 109.
The Belgic Confession. (n.d.). Grand Rapids, MI: Christian Reformed Church in North America. https://www.crcna.org/welcome/beliefs/confessions/belgic-confession
The Westminster Confession of Faith. (n.d.). Grand Rapids, MI: Puritan Reformed Theological Seminary. https://prts.edu/wp-content/uploads/2016/12/Westminster_Confession.pdf
Tohatta, D. (2023). Holy Communion as Inclusive Space of Encounter for People with Disabilities. Indonesian Journal of Theology, 11(2), 375. https://doi.org/https://doi.org/10.46567/ijt.v11i2.391
Travis, H. T. & J. (2015). Understanding insider movements: Disciples of Jesus within diverse religious communities. CA: William Carey Library.
Travis, H. T. dan J. J. (2015). Understanding Insider Movements: Disciples of Jesus within Diverse Religious Communities. William Carey Library.
Travis, J. (2000). Messianic Muslim Followers of Isa: A Closer Look at C5 Believers and Congregations. International Journal of Frontier Missions, 17(1), 54.
Trueman, C. R. (2018). The Creedal Imperative. Crossway.
York, B. J. (2022). The Sacraments as a Mark of the Church. Reformed Presbyterian Theological Journal, 9(1), 9.
