…Secular States cannot be biased to one religion especially in an increasingly diverse population. Therefore we can’t or shouldn’t use our own personal morals and impose it on everyone else.
And thirdly, as I mentioned above, same-sex couples being married doesn’t hurt anyone, unless you have your own prejudices or bigoted views. If Aunties Tom and Dom from down the road decided to get married/have a Civil Union, how does that change anything for you? Do they suddenly smell really bad? Do they impinge on your right to walk down the road? Do they hurt your eyesight now they are in union of some kind?