No, but there is a difference between sacramental marriage and natural marriage. As Chuck says, the family depends on marriage, and society depends on the family. As marriage goes, so goes society.
The redefinition and dissolution of civil or natural marriage represents a death blow to society. In fact, it's historically unprecedented.
I don't see a problem here.
If you can find a single quote from the New Testament in which Jesus Christ suggested that Christians had an obligation to protect their society from falling apart as a result of a wholesale rejection of the Gospel.
One of the most sobering Gospel passages is the temptation of Christ after He spent 40 days fasting in the desert. When Satan showed Him all the kingdoms of the world and offered to give them to Jesus if only He would kneel down and worship Satan, the most important thing to remember is not what Christ said in response, but what He didn't say. He never told Satan that the world wasn't his to give to anyone.