The motto "Unity in Diversity" is still a goal that continues to be strived for. In Indonesia there are still many social conflicts that are motivated by ethnic and religious fervor. It is undeniable that on the other hand religion has been a very important factor for generating a sense of solidarity in Indonesian history. This means that social solidarity within certain limits has become social capital which is very useful for the rise of the spirit of nationalism, but if social solidarity is developed in an atmosphere that is closed only to social groups then it will become a threat to national unity. Generation Z Christians who are educated in Christian families, develop their religious activities in the church, and most of them attend Christian schools tend to be trapped in narrow social solidarity. This research aims for Developing Indonesian Social Solidarity among Generation Z Christians in the City of Kupang and Bandung through teaching modules and teaching media in schools . Based on results study year first , then on year second developed module for child 2nd grade junior high school for increase solidarity social to Indonesian . Method research used _ use framework study development of Borg and Gall through 9 steps development . The results of the research are the teaching modules were very good to use, however, according to the students' input, the teaching modules were improved from the aspect of more images and incorporating local material. Meanwhile, the size of the text will be enlarged when using teaching media, because it can be enlarged in teaching modules which will disrupt the arrangement of the book as a whole. Keywords: social solidarity, module and teaching media, religious education, generation millennial.