Adolescent substance abuse has been on the rise for the past few decades, constituting a major personal and social problem. According to researchers, the causes are many, including biological, temperamental, psychological, behavioral, and environmental factors. Yet, only a few intervention methods have proven effective. Numerous studies demonstrated that religious beliefs and practices exert a deterrent effect on substance abuse among teens. However, there is little information available that applies specifically to Jewish adolescents from an orthodox background. This pilot study was conducted with a group of substance abusing Jewish adolescent boys attending an alternative religious high school, to examine the influence of religiosity of substance abuse therapy outcome. The assumption was that the religious environment would influence the boys to better respond to therapy, adding another weapon in the war against teens substance abuse. Three appendixes contain a religiosity questionnaire, diagnostic schedule, and data table. (Contains 72 references.) (Author)