What should I say in an essay on the idea that the law of marriage in Australia should be amended to allow homosexual couples to marry?

There are many points that you could bring up in an essay
on this subject.  Among them are:

• Equal rights. 
  You could argue that people should not be discriminated against simply because they want
  to marry someone of their same sex.  Gay marriage, you could say, is nothing more than a
  part of giving people equal rights.


• Law should not be
  driven by religion.  This is a point you could make to refute one of the major arguments
  against gay marriage.  You could argue here that the main reason to ban such marriages
  is that they are against traditional Christian morals.  You could say that it is not
  right for the government to enforce the moral beliefs of a particular
  religion.


• Gay marriage is actually good for society. 
  Here, you could argue that society benefits when people remain in committed
  relationships.  If family is the basis for society, shouldn't we want more people to be
  in stable families?  Allowing gay marriage would be a way to promote
  this.

If I were writing a 5 paragraph essay on
this issue, these would be my three main arguments.