- higher divorce rates
- higher jobless rates
- both parents working = negligent parenting (the main one, which has all sorts of flow-on effects)
Yeah, all people are equal (though it's becoming more common for certain groups to be given special treatment). That has nothing to do with marriage. Marriage is between a man and a woman; any other relationship is excluded. It's like the MCC; if you don't qualify for membership, you can't be admitted.
Call it something else with exactly the same status and I wouldn't be opposed.
None of your examples are the consequence of gender equality or supported by the facts. For example, in 1979 40% of women were employed. Now it is 59%. In 1979 the unemployment rate was 6%. Now it is 5.7%. Clearly women in work does not cause high unemployment.
Your assertion of "negligent parenting" is entirely at odds with the objective reality of modern society. You are entitled to be conservative in your views but this doesn't grant entitlement to ignore fact.
Marriage in Australia is only currently defined to be between a man and a woman to specifically exclude same-sex couples and this is a recent development. So your MCC example is akin to saying "You were eligible to join the MCC but we changed the rules to make sure you can't because we don't like you". I'm sorry, but that's not reflective of the type of society most Australians want to live in.