Parents have a very important and central role in the formation of religious attitudes and the defense of Hindu adolescent religiosity. The impacts caused by social interaction in different societies of different religious backgrounds, greatly affect the development of Hindu teenagers, especially in terms of psychic (mental). If the important role of parents can be applied optimally in the family, then the case of religious adolescent decline in religiosity will be suppressed.This research was conducted in Tulungagung District, East Java Province. The purpose of this study is to know: (1) the background of the need for religious adolescent religiosity in Tulungagung regency; (2) obstacles that hinder the maintenance of the religiosity of Hindu adolescents in Tulungagung District; and (3) the efforts that parents need to make in the defense of Hindu adolescent religiosity in Tulungagung District.The results showed that religious adolescent religious religiosity was perpetuated through religious activities. In addition, the role of parents and Hindu society is also very influential on the religiosity of Hindu adolescents. Constraints that hamper the defense of Hindu adolescent religiosity can be grouped into two, namely internal constraints and external constraints. Efforts that can be done by the parents as the most important party to maintain the religiosity of Hindu adolescents is to provide education about the teachings of Hinduism early in the child, provide an example of how to diligent teachings of Hinduism properly, and familiarize children perform religious practices. If the effort can be well implemented by the parents, then sraddha and bhakti adolescent Hindu will become very strong and not easily wavered by the influence that exists in the environment.