This tiny fell church is dedicated to St Michael’s. Although it is unclear when there was first a church or chapel on this site, in 1546 it was held by an elderly priest named Henry Bankes who was paid an annual stipend of £4 from Thomas Salkeld of Corby, the lord of the manor. In 1653, John Banks, a fifteen-year-old youth, son of a local fellmonger, was reader at Mosser chapel. His duties were to read the Scriptures and homily, sing psalms and lead prayer on Sundays, for which he received a salary of 12d. yearly from each household on top of free board and lodging, probably an example of the ‘whittlegate’ system by which readers in Cumbrian chapels of ease were often maintained.
The church was rebuilt in 1773 and then was due to be replaced by St Philip's in Eaglesfield but a campaign in the 1920's to repair it brought it back into use and this continues to the present day. The are monthly services in the summer months. It has no mains electricity, heating or road access. It has one stained glass window – of the Holy Dove with multicoloured patterns of curling leaves and grapes.