Religious radicalism is one thing that threatens security and peace. FKUB Pekalongan City is one of thecommunity organizations formed by the government that effectively provides a good impact on the survival ofa tolerant, inclusive and multicultural life. Deradicalization is a concrete step to fortify religious radicalismby harmonizing religion. This research is a qualitative descriptive study with interviews with researchsubjects and supplemented with supporting literature. The result of this study is FKUB Pekalongan City asone of the organizations that can be a peace spreader among young people, women, and the smallest structureof the State, the family. Religious harmony is an important part of creating dialogue, understanding ofPancasila and being united in diversity.