Not only have they been "brave" enough it has actually been enshrined in legislation.
If that is so, why do churches still exist? Why are ministers of religion allowed to spout the nonsense? Perhaps you mean that it cannot be taught in secular schools, but religion is far from being "cancelled" as it should be.
And in the 50s, I'm pretty sure it was Empire Day we were celebrating. See below:
The celebration of Queen Victoria's birthday on May 24 was renamed Empire Day in 1903 after her death in 1901. It was celebrated throughout the British Empire culminating in fireworks and bonfires in the evening. The last celebration of Empire Day in Australia took place in 1958.