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.
Some history
Mannanarie Methodist Church
In 1880 the Primitive Methodists began building a more permanent church with the foundation stone being laid on 1st March 1880. The porch was added in 1901 with regular services being held until 8 October 1972. The building and other assets of the church were transferred to the public hall in 1983.
Now to find the final
From the information sign
S33 02.ABC
E138 37.DEF
Where A = services continued until 19A6
Where B = 197B a special centenary
Where C = Public hall in 1C83
Where D = Porch added in 190D
Where E = Yongala circuit until 19E7
Where F = on Fth October
Checksum = 30
Happy hunting !!