And based on what you are saying, a homosexual relationship does not have as much importance to society as a heterosexual couple. So it makes sense to treat the homosexual couple differently under the law, since the underlying relationship is not as important. Yes that hurts the self esteem of the liberal community to say that, but it’s true.
More to the point, a child needs a mother and a father. Marriage is not about exclusive adult sexual gratification, as people seem to assume. Its role is to give legal title to their offspring and to help raise the next generation. Those are aspects of marriage that no homosexual union, however well intentioned it might be, is capable of fulfilling. We need to really have a debate about what is best for the children. Calling people bigots for opposing a marital union that would damage our kids is undeserved. We need a debate over marriage and its not the one we're getting from those who wish to redefine the meaning of the institution.
"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." - Manuel II Palelologus