Jim Belshaw has an interesting post on this, to which I wrote an off-the-cuff response for the sake of discussion, and Jim has replied. My answer, basically, is “No”. Except in a very broad cultural sense. One could also ask the question in the past tense, as Jim has, and one would get very many answers, as indeed Jim points out. Obviously Australia is more a Christian culture than it is a Buddhist, Hindu, Taoist, Muslim, or Jewish one, yet all those are, and in all cases long have been, living traditions within Australian culture, not to mention what remains of Indigenous spirituality.
Much better heads than mine have asked the question; it disturbs me nonetheless when people like the current Prime Minister make assumptions about our being a Christian country. My argument would be that we are very much a non-religious country in very important respects, even more deeply than the fact there is not and cannot be an established religion. I would even argue that secularism has been a critical ingredient both intellectually and practically, a point I made — or tried to make — in my comment on Jim’s blog. (Didn’t Manning Clark devote a lifetime and many pages to constructing a long epic poem of a history on this theme? At least he thought it mattered, which made him a rather odd “Marxist”.)