This collection of caches has nothing to do with the Church Micro series in the UK. Given that the Australian 2016 census indicates that No Religion and Jedi Knight are the fastest increasing classifications of the optional religion question "What is the person's religion?" it is not surprising that there is surfeit of empty churches that have been repurposed.
The Old Noarlunga Uniting Church had its beginnings when a Wesleyan Chapel was built in 1855. The current building is constructed from limestone rags and brick quoins. The church was recorded as the second oldest remaining Methodist Chapel in South Australia. The church closed in 2019.
Using the digits of the date July AB CDEF on the foundation stone that can be seen from the footpath you can determine the location of the geocache.
S35° 10.DEE' E138° 30.F(D-C)(A+B)'
Checksum: 9 + 16 = 25