Religious character is one of the 18 aspects of character values according to the Indonesian Ministry of Education and Culture which ranks first. Its position in the first order illustrates that this character is the most important character that must be possessed by children. In line with the concept of child education in Islam in Abdullah Nashih Ulwan's view. Abdullah Nashih Ulwan is a Muslim figure who plays an active role in the field of da'wah and Islamic education. He argues that true character education is to direct humans to have good personalities who hold fast to the values of faith in Allah SWT and realize that Allah SWT is always watching over them. Religious character is the character, character or personality of a person who is closely related to God and is based on the teachings of the religion he adheres to. The environment that plays a very important role in the formation of this religious character is the family environment. This study aims to analyze the concept of children's education in Islam according to Abdullah Nashih Ulwan. Then the concept that he explained is relevant to the formation of religious characters in the family environment. This research is a library research with a content analysis research approach or content analysis, then data collection is carried out and draws conclusions from the research results. The results showed that the concept of children's education in Islam according to Abdullah Nashih Ulwan has a close relationship in the formation of religious character in the family environment. Awareness of parents in carrying out the responsibilities of faith education, moral education, intellectual education, physical education, psychological education, social education and sex education accompanied by methods of educating by example, methods of educating with advice, methods of educating with habituation, methods of educating with attention and punishment very influential in the formation of religious character in the family environment. Keywords: Religious character, children's education, family environment.