The Hexi Corridor, a critical part of the ancient Silk Road in northwest China, presents a compelling case for studying the relationship between religious diversity and tolerance, shaped by historical conflicts. This study examines these dynamics at the Mogao Grottoes, a key site for understanding regional religious and cultural exchanges. Utilizing spatial archaeology and G. William Skinner’s Human Interaction System, which highlights emic perception and utilitarian approaches, the research investigates the connection between religious practices and external influences.Historically, the Hexi Corridor has been a hub for the interaction of various ethnic and religious groups, as far as Buddhism, which became predominant by assimilating local customs and integrating with other major religions. This led to a unique blend of religious tolerance and cultural synthesis, particularly reflected in the adaptive use and spatial development of the Mogao Grottoes—from private religious sites to accessible cultural landmarks. This transition underscores the balance between spiritual devotion and secular utility. The study explores how changes in the grottoes’ spatial and arrangement design mirror wider socio-cultural transformations in the corridor, with a gradual shift from strict religious observances to more inclusive practices, suggesting a utilitarian approach to maximizing communal benefits. The findings illustrate that religious tolerance in the Hexi Corridor is a complex result of ongoing interactions and adjustments, supporting a dynamic equilibrium between sacred and secular spheres. This research contributes to a broader understanding of religious dynamics, offering a framework for studying similar phenomena in diverse historical and cultural settings.