Research consistently associates religious participation with positive health outcomes, yet "spiritual but not religious" has become the third largest group worldwide. Young adults are struggling, and spiritual struggles do not disappear when people leave organised religion. This invites a deeper question about how to approach spiritual health in the raised importance of whole-person care. Young adulthood is an intensive season of meaning-making, and the evidence suggests these individuals should not be navigating it alone. Churches are well positioned to offer mentoring and a sense of belonging, yet they largely lack the tools to move beyond attendance metrics toward a genuine understanding of the lived experiences of their young adult congregants.This exploratory, multimethod qualitative study situates itself at the intersection of healthcare, religious communities, faith development, and design practice. If looking from a human flourishing perspective, it stands between religious communities (as one pathway) and mental health, meaning and purpose, and close social relationships (as domains). It ex-amines how Hungarian young adults within the Reformed Church in Romania narrate their faith journeys, how religious community shapes their meaning-making processes, and how a service design mindset can help faith communities become more intentionally responsive to the young adults in their midst — for the benefit of their spiritual health. Grounded in4both critical realism and interpretivism, it uses narrative inquiry and case study logic within a specific, bounded context. Participants included young adults aged 18–29 and pastors across multiple levels of church leadership, all involved in youth work in varying capacities.The thesis does not evaluate doctrine or theology, but positions itself within the first diamond of the double diamond, seeking to understand lived experience and context first. In a church setting, service carries a different meaning — one that called for extra care and contextual sensitivity throughout. The study begins with autoethnography — a deliberate choice, rooted in the larger story of this thesis. Before listening to others' inner lives, the researcher's own faith journey was examined first. The research does not recommend exploring others' faith narratives without that prior self-examination.Findings reveal genuine pastoral openness toward relational mentoring, accompanied by a significant structural gap that prevents this intention from taking root. Accountability re-mains tied to numerical measures while the slow, invisible work of accompaniment goes unsupported. The most intensive pastoral investment ends precisely when young adults most need it — the transition out of youth groups at 18–20. The institutional frame defaults to program delivery over relational presence. We are all searching for something, aren’t we? This is endorsed by young adults and pastors alike. While in this search, desires for change also appear, the research argues that forms can change but content cannot.The study makes methodological, conceptual, and practical contributions, representing a first attempt to adapt service design tools — specifically, journey mapping — to research faith narratives in a Reformed Church context, a much-appreciated initiative by young adults. A first faith-journey mapping template has been produced, though it requires further testing before it can be fully replicated. For anyone curious about the relationship between faith, religion, and spirituality — concepts more nuanced and more connected to spiritual health than is often recognised — this thesis may also be a worthwhile read in its own right.The outcomes point toward a foundation for future co-creation between design practice and practical theology — grounded in genuine listening, theological seriousness, and practical humility.