Fr. Vincent Serpa #fundie forums.catholic.com
[Why is non-religious "gay marriage" not ok?]
The union of two members of the same sex is simply not marriage. To say that it is, leaves the union that marriage has always been without a word to identify it.
If we begin to assign the word “cat” to dogs, we are left without a word to describe that small feline that people have for pets.
Further, changing the name of a thing does not change the nature of what that thing is. A rose by any other name is still a rose. The relationship of two people of the same sex will always be that—regardless of what one calls it. It will never ever be the union of two persons whose individual sexualities complement and complete each other in every way. Only marriage is that. We are talking honesty here. To say that two different things are the same is simply not the truth!