The neo-phenomenological theory of atmosphere has widely described ambiances of built environments and factors of staging atmospheric effects, yet seldom discussed places of worship. Strategies of designing atmospheres in sacral architecture present a heightened relevance in migration context: faith communities replicate historical models from their home country, adapt buildings which previously served utilitarian purposes or as places of worship for a different confession, and are "contaminated" by the culture of the host country. Although such processes are well-known in the history of architecture, they used to be explained in terms of practical-functional conversion and semantic-symbolic reinterpretation. The lecture argues that the emotional turn the aesthetics of ambiance partakes in sheds new light on the religious experience by emphasizing the diversity within Christianity based on the atmospheric profiles of its confessions. In particular, the dynamics of religious atmospherics will be illustrated by converted places of the Orthodox Church(es) in Vienna.