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Ecclesiology and the church's calling amidst the development of the times marked by increasingly dynamic social, cultural, technological, and lifestyle changes. The background of the problem in this paper departs from the fact that the church often faces challenges in maintaining its theological identity while responding to the demands of the modern era, so that a contextual and relevant understanding of ecclesiology is needed. The research method used is a qualitative method with a library research approach, namely reviewing and analyzing various library sources such as the Bible, theological books, scientific journals, and church documents related to ecclesiology and the role of the church. The purpose of writing this article is to re-examine the nature of the church from a theological perspective and formulate the church's calling to remain faithful to God's mission amidst the changing times. The benefits of this paper are expected to provide theoretical contributions to the development of church theology studies and become material for practical reflection for the church in carrying out its duties of fellowship, service, witness, and diakonia in a relevant, contextual, and responsible manner in modern society.

The Theology of Mission in Pluralism, as presented in the Book of Jude, provides an understanding of God's mission (Missio Dei) that is universal and involves the Church's participation in proclaiming the Gospel amidst cultural and religious diversity. This study aims to explore the concept of theological mission found in the Epistle of Jude, particularly in the context of pluralism in culture and religion during the early Church period. Using an exegetical method and literature analysis, this research identifies that Christian mission according to Jude is not only limited to the proclamation of the Gospel but also includes the struggle against false teachings and the strengthening of the faith of the believers. The mission in the Book of Jude emphasizes the importance of showing compassion to those who are uncertain in their faith, as well as the need for decisive action to save people from the fire of judgment. Furthermore, this study reveals that the Church plays a central role as the sphere of mission, where the congregation is called to remain firm in faith and contribute to saving others from misleading teachings. Overall, the theology of mission in pluralism according to Jude teaches the importance of balancing firmness in upholding the truth with gentleness in guiding those who are uncertain.

The word mission is derived from Misio Dei, meaning that the Triune God plays a role in it, God the Father, the Son, and the Holy Spirit. Understanding the role of the Triune God in Misio Dei will help a strong mission movement in the church. The church is the channel of God's mission to proclaim the good news that the Kingdom of God has come. The church is responsible for carrying out God's mission so that the mission movement remains sustainable. The younger generation is the only successor to the mission movement in the church, therefore it is necessary to discover the obstacles in the mission movement in the younger generation so that the church continues carrying on the mission. JKI Injil Kerajaan Church is one of the churches whose mission is to build a generation of disciple leaders who are pleasing to God and impact others. The younger generation at the JKI IK Church has not become missionaries since 2020. The factor that influenced the decline in missionaries at the JKI IK Church was the existence of an identity crisis. This self-identity crisis can be addressed by strengthening the relationship with the Holy Spirit. In addition, we must learn from the expansion of the early church where the supporting factors for the expansion of the early church were the renewing power of the Gospel, fruitful and reaping evangelistic motivation, context-appropriate service variations, conducive geo-political factors and recruiting workers for the expansion of church missions.

This article examines the theological basis and implementation of mission in the New Testament and its relevance to the church today. This research is motivated by the crisis of missionary identity in the church amid the challenges of globalization, secularization, ecological crisis, and relativism of truth. The main focus of this research is on the concept of missio Dei, which emphasizes that mission originates from the initiative of the Triune God, not solely from the church. The objective is to analyze the theological foundations of mission in the New Testament and how the church lives out its calling as a sent community. The method used is qualitative, employing a literature review approach to the Bible, theological literature, and academic journals. The main findings show that mission is the identity of the church, not just one of its programs. Mission in the New Testament is Trinitarian, holistic, and includes the proclamation of the Gospel, acts of love, social justice, and the formation of an inclusive community. The early church set an example through its living witness and cross-cultural evangelism. In the contemporary context, implementing mission requires contextual approaches such as digital ministry, social empowerment, discipleship, and interdenominational collaboration. The synthesis of key ideas emphasizes that mission cannot be separated from the existence of the church; without mission, the church loses its identity. In conclusion, the church today is challenged to return to the contextual, transformative, and Spirit-led mission of the New Testament to remain relevant in an ever-changing world.