A question on religious affiliation has been included in all Australian censuses, but answering this question has always been optional. In the 2006 Census, 13% of Indigenous people did not answer the question compared with 7% of the non-Indigenous population. Of those Indigenous people who responded to the question 24% reported they had no religious affiliation compared with 21% of the non-Indigenous population.
Among Indigenous people 1% reported affiliation with an Australian Aboriginal traditional religion. Affiliation with a traditional Indigenous religion was highest in Very Remote areas (6%) than in all other areas (less than 1%).
In 2006, 73% of the Indigenous population reported an affiliation with a Christian denomination. Of these, approximately one-third reported Anglican and one-third Catholic.