Under conditions of rises in the maintenance costs of religious objects, declining numbers of visitors to most of them, and greater public awareness of their potential, the following is becoming important: (1) the pressure to increase the ways in which their space is used and (2) to take advantage of the “added value” that these objects bring to the localities in which they are located. The owners of religious objects are increasing the functionality of these objects; therefore, they can expect more financial support for their maintenance, including from public resources. Local entrepreneurs undertake and develop types of economic activities that are directly or indirectly related to the existence of the designated objects in the area, and the local government, thanks to the tax revenue raised from them, improves the standard of living of the people in the area. The purpose of this article is to collect, organize, and systematize the knowledge of the functions of Christian historic religious objects and the possibility of their influence on the external environment. This study fills a research gap in this area, for the information on this topic in the literature is scattered and unstructured. The method used in this study is a critical analysis of legal acts and literature. From the analysis, it is clear that Christian religious buildings today perform multiple functions. In addition, the strength of their impact on the external environment creates the economic development of an area and results in an increase in the income level of its inhabitants.