Missionary societies often house both churches and ethnographic museums, placing theology and anthropology in close institutional proximity while subjecting objects to distinct epistemological and moral regimes. In ecclesial spaces, artefacts are framed as sites of devotion, moral formation, and spiritual efficacy; in museum contexts, they are rendered as ethnographic specimens, colonial remnants, or candidates for critical emancipation. These divergent framings reveal not only historical inequalities rooted in missionary and colonial encounters, but also ongoing struggles over authority, memory, and belonging. This paper examines how inequalities in differing spiritual practices are produced, negotiated, and contested through the classification and display of artefacts within missionary collections. Drawing on ethnographic research conducted over the past two years in the Steyler Missionary Society in Sankt Augustin, Germany, it focuses on the asymmetrical treatment of European Christian artefacts in contrast to both non-European Christian and non-Christian religious objects, and on the criteria through which sacred value is attributed, withheld, or reconfigured.