The article analyzes the process of integration of traditionalist communities into the space of postsecular culture using the example of the organization of confessional museums in modern Old Believer communities. Based on field material recorded by the author in 2017–2025, the author demonstrates the desire of Old Believers to appropriate secular educational practices to preach their faith, form and maintain collective memory, in particular, the traumatic experience of persecution. At the same time, the contradictions that museum organizers – community leaders and Old Believer activists – inevitably encounter are noted. This concerns general negative perception of museumification as a form of decline of religious tradition between old-believers, and the possibility of demonstrating ritual practices and sacred objects in the museum space. Attempts to resolve the existing contradictions lead to a complex symbiosis of secular and religious practices, which in many ways reflect the specifics of the culture of a postsecular society.