Less remarked upon is the old church that sits within the settlement, a structure recorded as a monument of archaeological interest but whose detailed history remains, for now, largely undocumented in publicly accessible form.

The church at Tynagh belongs to a pattern common across the parishes of east Galway, where early ecclesiastical foundations, sometimes of medieval origin, were built upon, repaired, and occasionally abandoned across successive centuries. East Galway was an area of considerable ecclesiastical activity throughout the medieval period, with Hiberno-Romanesque and later Gothic traditions leaving traces in stone across dozens of townlands. Without more detailed records currently available, it is difficult to assign precise dates or dedicate the building to a particular foundation, patron, or phase of construction. What survives at Tynagh is a reminder of how much of rural Ireland's religious built heritage remains incompletely catalogued, its stones present in the landscape long before the paperwork catches up.