I don't particularly want to discuss the sinfulness of homosexual genital activity, it is pretty obvious if you have a Catholic understanding of the nature of marriage as something open to the procreation and upbringing of children, that such relationships are at the least problematic and are indeed disordered, and sterile by their intrinsic nature.
My concerns are:
The denial of parents right to discriminate against or in favour of any group for the sake of their children. Catholic adoption agencies do not pick up children off the streets but from people who want their children brought up in the Catholic faith. Nowadays the birth parents of a child are expected to continue there involvement with the child as far as is possible.
This seems to place homosexual civil unions on the same level as marriage, it seems to be part of an agenda to force an acceptance of same sex relationships, increasingly we find the state agencies including the police are used to enforce this agenda.
I do not feel it fair for a child who often has enough painful baggage because of the break up of his/her birth family which has led to being placed for adoption should also have to deal with his/her adoptive parents' sexuality as well.