The basic terminological issues related to the issue of religiosity-religion, religiosity, mature religiosity and religious maturity-due to their ambiguity require detailed analysis, but they are not the only ones. Concepts of religiosity also turn out to be important. Issues related to religious development and its factors are also worthy of consideration. After all, deaf and hard-of-hearing adolescents accept and/or identify with Christianity, being members of the Catholic Church and attending/not attending, to a greater or lesser extent, school catechesis classes and engaging/not engaging in d/Deaf pastoral activities.