tion system operates as the largest non-government educator, accounting for about 21% of all secondary enrolments as of 2010, with Catholic Health Australia similarly being the largest non-government provider. Christian welfare organisations also play a prominent role in national life,

Australia has no state religion; Section 116 of the Australian Constitution prohibits the federal government from making any law to establish any religion, impose any religious observance, or prohibit the free exercise of any religion.[261] In the 2011 census, 61.1% of Australians were counted as Christian, including 25.3% as Roman Catholic and 17.1% as Anglican; 22.3% of the population reported having "no religion" (which includes humanism, atheism, agnosticism and rationalism); 7.2% identify with non-Christian religions, the largest of these being Buddhism (2.5%), followed by Islam (2.2%), Hinduism (1.3%) and Judaism (0.5%). The remaining 9.4% of the population did not provide an answer.[235]
St Mary's Catholic Cathedral, Sydney, built to a design by William Wardell. About a quarter of Australians are Roman Catholic.

Prior to European settlement in Australia, the animist beliefs of Australia's indigenous people had been practised for millennia. In the case of mainland Aboriginal Australians, their spirituality is known as the Dreamtime and it places a heavy emphasis on belonging to the land. The collection of stories that it contains shaped Aboriginal law and customs. Aboriginal art, story and dance continue to draw on these spiritual traditions. In the case of the Torres Strait Islanders who inhabit the islands between Australia and New Guinea, spirituality and customs reflected their Melanesian origins and dependence on the sea. The 1996 Australian census counted more than 7000 respondents as followers of a traditional Aboriginal religion.[262]

Since the arrival of the First Fleet of British ships in 1788, Christianity has grown to be the major religion. Consequently, the Christian festivals of Christmas and Easter are public holidays, the skylines of Australian cities and towns are marked by church and cathedral spires, and the Christian churches have played an integral role in the development of education, health and welfare services in Australia. The Catholic education system operates as the largest non-government educator, accounting for about 21% of all secondary enrolments as of 2010, with Catholic Health Australia similarly being the largest non-government provider. Christian welfare organisations also play a prominent role in national life, with organisations such as the Salvation Army, St Vincent de Paul Society and Anglicare having widespread support. Such contributions are recognised on Australia's currency, with the presence of Christian ministers such as Aboriginal writer David Unaipon ($50); founder of the Royal Flying Doctor Service, John Flynn ($20); and Catherine Helen Spence ($5) who was Australia's first female candidate for political office. Other significant Australian religious figures have included Mary MacKillop, who in 2010 became the first Australian to be recognised as a saint by the Roman Catholic Church and Church of Christ pastor Sir Douglas Nicholls who, like Martin Luther King, Jr. in the United States, led a movement against racial inequality in Australia and was also the first indigenous Australian to be appointed as a state governor.