In high-Andean Peru, Rapaz village maintains a temple to mountain beings who command water and weather. By examining the ritual practices and belief systems of an Andean community, this book provides students with rich understandings of unfamiliar religious experiences and delivers theories of religion from the realm of abstraction. From core field encounters, each chapter guides readers outward in a different theoretical direction, successively exploring the main paths in the anthropology of religion. As well as addressing classical approaches in the anthropology of religion to rural modernity, Salomon engages with newer currents such as cognitive-evolution models, power-oriented critiques, the ontological reworking of relativism, and the "new materialism" in the context of a deep-rooted Andean ethos. He reflects on central questions such as: Why does sacred ritualism seem almost universal? Is it seated in social power, human psychology, symbolic meanings, or cultural logics? Are varied theories compatible? Is "religion" still a tenable category in the post-colonial world? At the Mountains’ Altar is a valuable resource for students taking courses on the anthropology of religion, Andean cultures, Latin American ethnography, religious studies, and indigenous peoples of the Americas.