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 former St Giles Church (also known as the High Church) and Free Church School occupy a site which was granted to the Free Presbyterian Church congregation in 1853.
From the foundation stone attached to the church, take note of the numbers, 9th July ABCD to calculate the final location of the geocache
S38 09.(A-1)D(C-A) E144 21.(C/2)A(B+D)
Checksum 6 + 13 = 19