Christian schools are popular in Australia. Australian values are based on the on the Judaeo-Christian traditions as per Australian Federal Government

The concept of “Judeo-Christian values” in an ethical (rather than theological or liturgical).
Former Australian Treasurer Peter Costello explains the Judeo Christian Tradition that forms the basis of our society: in a speech from 2004.

The country two biggest celebrations are Easter and Christmas. And wearing a symbol of Christianity is not common in Australia? Then who’s  buying all those crosses and crucifixes that are sold in Australian shops? :)