The aim of this article is to present a framework for studying the religious identity development of highly religious Christian and Muslim adolescents. Building on existing theories on identity development, the authors define highly religious Christian and Muslim adolescents as "orthoprax" adolescents and explore the consequences of this for reflection on the religious identity development of these groups of youngsters. This study is a first step toward gaining qualitative insights into the religious identity development of orthoprax adolescents and filling up a perceived gap in research on religious identity development.