The parish church in Mittelberge was consecrated on May 18, 1968 by the then auxiliary bishop Dr. Johannes Joachim Degenhard.
The architectural style of the church is characterized by the spirit of the Second Vatican Council and the "aggiornamento" advocated by Pope John XXIII. According to this, churches should be gathering places for Christians, where the faithful come together around the altar, which is the focal point. The previously prescribed orientation of the church with the altar facing east was abandoned.
The architect Aloys Dietrich from Paderborn has solved these ideas well with his chosen ground plan of a square, the corners of which are truncated. The truncated square corners are used for the closed back wall of the altar, on the opposite side for the annexation of the tower with entrance hall and gallery, on the sides for the sacristy and side altar. The pews surround the altar in a semicircle.
The organ of the church comes from the Benedictine abbey Königsmünster in Meschede. It was brought in on March 1, 1970, when the monastery church, which was also new, received a new organ and the old one, which still came from the emergency church, was dispensable.
At the end of 1972 three new bells were hung in the tower. They came from the Heidelberg bell foundry in Heidelberg and were consecrated in the names of St. Mary, St. Joseph and St. Lucia. The casting of the bells themselves took place on 17.10.1972 in the Ulm/Danube ironworks. Everything was directed and supervised by the energetic hand of the parish priest Heinrich Winkelmann.