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 Congregational Mission Church of Port Noarlunga was established in 1910 and closed in 1976. The building is now used as a hairdressing salon.
"When some of the people from the Mclaren Vale Congregational Church founded a cause in Port Noarlunga on June 21st, 1909 there were still only about ten houses in the town. A notice advertising the first meeting was posted on the door of Mr Sandilands shop and Mr Perry lent the Old Barn free of charge for the purpose. Mr Faulkner, the minister from Mclaren Vale and Mrs Sandilands swept the floor and arranged planks on kerosene cases to accommodate twenty-five people. Fortunately, some of the seventy-five who attended had the foresight to bring their own chairs. Three weeks later, Sunday School classes were begun in Mrs Sandilands' drawing room. Hymn books, Bibles and an organ were purchased within the first few months and land in Gawler Street was secured from the Congregational Union for £21. On February Xth, XXXX the foundation stones of the church were laid by Mr Henry Savage, the Chairman of the Congregational Union and Mr Henry Dunstan of Kensington. The building was constructed of local limestone. Red ochre, found in the cliffs above the mouth of the river, was used in the porch tiles. The first services were held the following February and for a time the church building was also used as a school."
Using the digits from the foundation stone to the right of the doorway Feb A, BCDE at the given coordinates you can determine the location of the geocache a short walk away. You do not need to enter the property.
S35° 08.C(A-B)(A+D)' E138° 28.(C/3)(B+D)E'
Checksum = 19 + 5 = 24.