back in the early days of the modern state when they were making rules and laws and such, when religion was almost ubiquitous, it heavily influenced values and the creation of rules and regulations under which the state operated. since then, thankfully the church and government are more separate (maybe not in parts of the US which can be really backwards about this stuff in some states, which is why this bill passing is so important).
i think its short sighted to say the government fucked up marriage, just because marriage as a concept has morphed considerably over the last few hundred years.
if your religion doesnt want to acknowledge same sex marriage, then thats an issue for that institution to decide on (i think religion sucks anyway), but its not fair that under the modern state which governs people of all faiths and beliefs, that some people have lesser rights than other citizens when it comes to forming romantic unions/partnerships.
its super annoying how some of the people opposing gay marriage are now acting like they are being marginalised and being hard done to, while LGTBQ+ people have had to put up with that shit their whole lives.
there are already plenty of loving gay couples out there getting on with their lives with their families exactly as heterosexual people do, meanwhile having no effect on those who speak out against them. yet because of their sexuality, for years their union has been perceived as less legitimate by the state simply due to their gender.
the whole issue is about equality for everyone, no matter who they love. in the future we will look back shamefully at the bigotry which permeated our society for so long, in the same way we look back at racial segregation 50-60 years prior
also, for the australian mandem, tony abbot is a total fuckwit and i cant wait til hes out of office