Within the HCI community, there is a growing interest in how technology is used and appropriated outside the workplace. In this paper, we present preliminary findings of how large displays, projection systems, and presentation software are used in American megachurches to support religious practice. These findings are based on ten visits to church services by the study's authors. We describe how large display technology augments and replaces certain church traditions, and finish by discussing issues related to the design for church environments that are highlighted by this use of technology. Keywords Religious technologies, large displays, field study ACM Classification Keywords H5.m. Information interfaces and presentation (e.g. HCI): Miscellaneous.