Australia is much the same as the USA in terms of religions and denominations. There are a few key differences though:
*]First of all, Agnostic Secularism is much more common in Australia than in the USA, as is Cafeteria Christianity, in my opinion. In general, Americans are much more happy to talk about God and religion than are Australians.
*]Conversely, there is much less anti-Catholicism in Australia, from what I can tell. I have come across Christians who have claimed that Catholics aren’t Christians, but they don’t seem to be as rabid as their American counterparts.
*]Catholics and Anglicans make up the vast majority of Christians, I think. There are less Baptists, Mormons and JW’s (percentage wise), but more Presbyterians.
*]There also exists “The Uniting Church”, which is a conglomerate of different Reformed Churches, I think.
*]As for non-Christian religions, I think they vary from region to region, as they do in the States. Typically the large cities - Sydney, Melbourne, Brisbane and probably the Gold Coast - would have higher percentages of non-Christians. But we have Muslims, Hindus, Buddhists and Jews. They are probably still in lower proportions than in the States - especially the Jews. I don’t think we have many Sikhs. [/list]
All of this is just coming from my personal experience, as such it should be taken with a grain of salt, especially considering I live in a very small city that is atypical in many ways to the rest of Australia (Hobart). I would say that the largest “religious” influence in Australia that is different from the US is in the rampant secularism. Christians are typically viewed as being backward and stupid, whereas non-Christians are probably viewed as “holding onto their culture from their ethnic country”, or some such. Even my friends can’t understand why I am a Christian, as they think I am too smart to be a Christian!