What if they push this idea, and sue the Catholic Church for refusing to marry a "gay" couple. Will the Catholic Church have to forego any marriages, because they won't marry "gays"?
Sacrament of Baptism
Sacrament of the Eucharist
Sacrament of Confirmation
Sacrament of Penance,
Sacrament of Matrimony,
Sacrament of Extremeunction or Anointing of the Sick,
Sacrament of Holy Orders
Since adaption of a baby has nothing to do with the sacraments there is nothing the Catholic church can do, but on the other hand marriage between a man and a woman is one of the seven sacraments the Catholic church can not be forced to marry 2 people of the same sex