Interfaith or multifaith chapels are so ubiquitous now in the United States—present in colleges and universities, hospitals, shopping malls, and airports—that their development as a distinct architectural form is often taken for granted. Yet that development in the mid-twentieth century was complex and even fraught. Taking a religious studies approach, this article examines the development of three early examples—the Chapel of the Four Chaplains, the Brandeis University chapels, and the MIT Chapel—to reveal the gradual movement, conceptual and architectural, toward a viable space serving many religions. While the former two examples proved unsuccessful in their goal of establishing a shared interfaith space due to their reliance on an understanding of religion as discrete traditions that resulted in exclusivist incompatibilities, the latter example moved beyond the emphasis on traditions to advance an unconventional, phenomenological understanding of religion as individual experience and spiritual life, and by doing so successfully achieved the goal of creating a space amenable to practitioners of many traditions, or none. Further, this article demonstrates how architecture functioned as a constitutive component in the developmental and popularization of this fresh understanding of religion and religious experience.

The phrase sacred space, suggesting a spiritually evocative environment infused with divine or transcendent presence, is currently applied to almost all religious places, including almost all Christian churches and chapels. Yet Protestant leaders from the Reformation onward vigorously opposed such an understanding of God’s relationship to humanly created worship space. For them, God was not immanent in specific spaces or buildings. How is it that Protestants came to embrace the idea of sacred space and apply it to their own churches? This essay explores the concept of sacred space and its relationship to Protestant architecture, focusing on the second half of the 20th century, a period that brought significant transformation to this relationship. The essay asserts that cultural, theological, and academic transformations occurring in the United States in the post-World War II period, resulted in the development of a universalized view of the sacred that came to undergird new religious spaces, particularly chapels meant to accommodate several faith traditions, which in turn helped to advance that view. Both the ideas and the buildings reflected a growing interest in personal spirituality and new understandings of the relative immanence and transcendence of God

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The study of religious space, both physical and imagined, has advanced significantly in the past two decades, drawing upon theoretical perspectives and analytical methods from several fields, from anthropology and historical studies, to geography and architecture, to social and literary critical theory. Marking a path through this varied landscape of approaches, this essay presents a four-part taxonomy into which most can be classified. The categories discussed are (1) Structuralist- hermeneutical approaches, (2) Socio-historical approaches, (3) Critical-spatial theory and approaches, and (4) Critical-spatial approaches from within the study of religions. This taxonomy is intended to aid scholars in clarifying their approaches to religious spaces, both physical and imagined, and thus advance the study of this constitutive component of religion.