This journal aims to explore the contextualization of theology in the development of the church in East Asia, focusing on the interaction between the teachings of the gospel and local traditional belief systems. The approach used in this study is a qualitative method. The findings of this study show that churches in East Asia attempt to integrate fundamental Christian teachings and adapt to local cultural needs and customs. The research found that despite efforts to create worship that is more relevant to local cultures, churches are still careful not to mix Christian teachings with traditions that could undermine the core teachings of the faith. In addition, the research also found that there is a difficulty in finding a balance between liturgical innovation and maintaining the holiness of Christian teachings. Too much adaptation to local cultural elements can lead to a loss of authentic Christian identity, while too little adaptation can make Christianity difficult to be accepted by society. To deal with this kind of conflict, churches in East Asia have endeavored to develop theologies rooted in their local traditions. In this way, churches in East Asia seek to create a deeper understanding of how the gospel can interact with the social, cultural and spiritual needs of local communities. One of the important findings of this study is also the importance of active congregational participation in the contextualization process. This congregational participation and diologetics help local churches to be more sensitive to existing social and cultural dynamics, as well as make a greater contribution in determining relevant forms of worship and teaching. This includes the avoidance of practices that could lead to syncretism, i.e. the mixing of Christian teachings with traditional elements that are contrary to the Christian faith.