Abstract: This study investigates the relationship between religiosity, spiritual practices, and trust in scientific institutions in Bulgaria, a country with Orthodox Christian traditions but also with a historically low level of trust in public institutions. Using Peter Berger’s “Sacred Canopy” theory, the research explores how traditional religious practices – such as church attendance, prayer, and the observance of religious holidays – along with overall levels of religiosity, influence public trust in scientific institutions. The findings reveal that individuals who engage in traditional religious practices and have trust in the Bulgarian Orthodox Church are more likely to trust scientific institutions, viewing them as part of a shared moral framework that promotes societal well-being. In contrast, those who adhere to New Age beliefs, which emphasise personal spirituality and alternative knowledge systems, demonstrate lower trust in scientific institutions. Overall, this study highlights the important role that institutionalised religion plays in legitimising scientific institutions in a context where trust in other public institutions remains low.