education system operates as the largest non-government educator, accounting for about 21 per cent of all secondary enrolments at the close of the 2000s (decade), with Catholic Health Australia similarly being the largest non-government provider. Christian welfare organisations also play a prominent role within national life, with organisations like the Salvation Army, St Vincent de Paul Society and Anglicare enjoying widespread support. Such contributions are recognised on Australia's currency, with the presence of Christian pastors like 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 St. Mary MacKillop, who became the first Australian to be recognised as a saint by the Roman Catholic Church in 2010 and Church of Christ pastor Sir Douglas Nicholls, who, like Martin Luther King 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.
For much of Australian history the Church of England (now known as the Anglican Church of Australia) was the largest religious affiliation, however multicultural immigration has contributed to a decline in its relative position, with the Roman Catholic Church benefiting from the opening of post-war Australia to multicultural immigration and becoming the largest group. Similarly, Islam, Buddhism, Hinduism and Judaism have all been expanding in the post war decades. Weekly attendance at church services in 2001 was about 1.5 million (about 7.8 per cent of the population).
An international survey, made by the private, not-for profit German think-tank, the Bertelsmann Foundation, found that "Australia is one of the least religious nations in the western world, coming in 17th out of 21 [countries] surveyed" and that
