One of the most important goals of education is to ensure the quality of teaching and learning. Sense of teacher's self-efficacy affects the quality throughout the contribution to all stakeholders in educational process. The right of religious education is one of the essential rights in the world. Moreover, it has positive effect on the society by helping to improve social relationship. Therefore, teacher self-efficacy belief based on religious groups is critical for stakeholders in religious education as well as other fields. The purpose of this study is to construct an instrument to measure teachers' sense of self-efficacy related to teaching compulsory K-12 theology courses. The result of the study indicates that the teacher self-efficacy scale towards religious groups is valid and reliable instrument. The instrument is going to be useful to look to peaceful future with confidence.