Bad news, but it is to be expected given mass immigration from non-Christian countries:
https://www.dailymail.co.uk/news/article-6244645/Christianity-plummets-Australia-Sikhism-Hinduism-Islam-grow.html
“Religion in Australia is steadily changing, with the number of people turning to Sikhism, Hinduism and Islam rising. The 2016 Census showed almost a third of Australia's population identify as having 'no religion,' although many of those still see themselves as spiritual. While Christianity's popularity has plummeted, down from 96.9 per cent of the population in 1921 to just scraping half of today's citizens at 52 per cent, Sikhism and Hinduism have steadily risen. In 2011, Hinduism and Sikhism had a combined 350,000 practitioners. The Australian Bureau of Statistics Census found that number had risen by over 200,000 people by the year 2016, with 80 per cent of those practitioners born overseas.”
Clearly, it is a myth of multicult-based mass immigration, that it leaves the host culture intact. On the contrary, it changes the society. First religion, then everything else. It is taking a long time for our tribe to wake up to this reality, but if it does not wake in fright soon, there will be nothing left. Mere ashes will blow through the postmodern wilderness.