The center of a church can refer to a few different things, depending on what aspect you're focusing on:
* Geographic/Physical Center: This isn't typically called anything specific. It's just "the center" of the building. The most prominent architectural feature or the area where the altar is located could be considered the focal point or center.
* Liturgical Center: The altar is often considered the liturgical center. It's the table where communion is celebrated and is a focal point of worship.
* Focal Point/Central Area: The sanctuary is the main area of the church where services are held, and could be thought of as a central area.
* Social/Community Center: Some churches have a separate area, often called a parish hall or community center, used for social gatherings and events. However, this is not the *center of the church itself* but rather an adjacent facility.
In summary, there's no single universally accepted term for the center of a church. The specific area and its purpose dictates the most appropriate name. If you want to discuss architecture, focus on the physical center. If discussing the ceremony or service, it is most likely the altar.