Christian identity is an important basis of Christian ethics since identity formulates the notion of how to live in and for the world. This research concentrates on Martin Luther's communitarian concept in his theology and ethics. Because the church is a liturgical community for the moral transformation, church needs to communicate with the world through her liturgical ceremonies. Based on this ethical concept in Luther, this research paper focuses on how Christian identity becomes the foundation of theological ethics, how Christian ethics is active in the relation with neighbors and how the church practises her ethics in community with the world.