Saint Peter's Church (Peterskirche), the church of Theisberg (Deinsberg), functioned as early as the High Middle Ages as the hub of a great parish that reached east of the Glan from Nanzdiezweiler over to Mühlbach, within which there were branch churches in Bosenbach, Neunkirchen am Potzberg and Niedermohr. Also grouped into this parish was the village of Stegen in the Remigiusland, which belonged to the church on the Remigiusberg. Meanwhile, Saint Peter's Church in Theisberg can be regarded as one of the oldest churches in the Glan valley. It was considerably older than the church on the Remigiusberg and without a doubt was preceded by a wooden structure. The first stone building might have arisen at the turn of the 12th century. While other churches were remodelled from the ground up in the time of Gothic architecture, Saint Peter's Church in Theisberg underwent conversions in almost every subsequent style epoch. The original steeple was said to be in disrepair at the end of the Second World War and was thus torn down in 1945 and then replaced with a new one in 1954.