This chapter provides five answers to the question of how religious buildings affect and shape the experiences of those who worship and visit. First, the building energy that begins with building projects is meaningful and possibly long lasting for congregations. Second, religious traditions provide architectural toolkits for congregations and architects to draw on. Third, design choices are constrained by access to and willingness to use economic resources, though congregations can be very creative. Fourth, a religious building can be influential through time, including how design choices affect later worshippers or how buildings can become sacred spaces for other groups. Fifth, cross-national cases suggest that religious architecture crosses national boundaries, illustrated by the influence of American Protestant megachurches on religious buildings in Guatemala. These findings have important implications for studying the materiality of religion, the “we”-ness of congregations, the religious experiences of individuals and groups, and how religious buildings arise and evolve.