Hello Sean:
I can tell from your comment that you have a misunderstanding about what the Catholic Church means when it says that homosexual acts are disordered and contrary to nature. The Catechism of the Catholic Church (CCC) puts it this way:
This is a subtle point, but one that is important. The Church does not teach that people with homosexual inclinations are disordered. It teaches that the acts are disordered. The term does not imply psychological or mental disorder, but the fact that the act of homosexual sexual intercourse is not ordered towards the natural end of such relations. In other words, male and female reproductive organs are made (i.e. ordered) for the purpose of procreating. Homosexual sexual acts are contrary to that order, because they are closed to the possibility of creating new life. Hence they are “disordered” or against “nature.” This is not a judgment of the person who struggles with same-sex attraction. It is a comment upon the act itself.
In no way can “nature” say to a person with same sex attraction that it’s okay to “marry” someone of the same gender. Marriage is an institution that was created to bond children to their natural parents because, by its very nature, the “marital act” (the act that is made legitimate in marriage) naturally leads to children. It is natural for man and woman to marry, because their union is fruitful and leads to children. It is not natural for two men or two women to marry because their union, no matter how loving and committed, is not fruitful. By nature, their union is not a marriage.
A person may “feel” that they should have the “right” to “marry” the person they love regardless of their gender. This thinking, however, misunderstands the very nature of marriage. It is based on the incorrect conclusion that “sentiment” controls–i.e. marriage is defined solely by the depth of feeling between the parties. Marriage becomes focused on the “happiness” of the parties when in fact their happiness is not the end of marriage. A stable family is the end of marriage.
It is sentiment that drives the current change in the definition of marriage, and the current change in the law. I would even concede that the change is, for the most part, the result of a feeling of compassion for people who live with same-sex attraction. But in my opinion it is a cruel lie to tell someone that their same sex union is a marriage when, by nature it is not and can never be a marriage, regardless of the real sentiment, and even love, existing between the two same-sex partners (again, notwithstanding homosexual acts, which can never be approved).
We can be a tolerant and fair society that gives rights to these same-sex relationships, and does not unfairly discriminate against persons with same-sex attraction. Indeed, we are called to be fair and loving as Catholics. But this should not mean we stand silent while the organs of our society redefine marriage.
Peace,
Robert