Die evangelische Kirche in Marienhagen gehört zu den fünf "Bonten Kerken" im Oberbergischen Kreis.
Today, all of the Bonten Kerken have been lovingly restored. In their simplicity and colourfulness, they offer a precious contrast to the often extremely ornate cathedrals and pilgrimage churches in the area.
The Protestant church in Marienhagen is one of the five "Bonte Kerken" (colourful churches) in the Oberbergisch district. In 1907, construction work led to the rediscovery of the medieval wall paintings at the church in Marienhagen, which were whitewashed at the beginning of the 17th century during a Calvinist (and therefore particularly hostile to the senses) reformation. The fragments of the paintings show the artistically sound outlook of an Early Gothic master of the highest order, attributed to the so-called “Cologne School” by experts.