Then you might support the idea of leaving the definition of “marriage” to churches, and keeping the government out of it entirely, I would imagine. The government could deal with the legal issues, and grant civil unions instead of marriages.
More to the point the government has an interest in promoting traditional, you do know what that means one would hope, marriage for obvious reasons, the number one reason being that they don't have to take more of my money to give to untraditional families, ie: no fathers.
Interracial marriage is a strawman argument used by lefties. Marriage has always been defined as the union of one man and one woman with certain age and relation requirements codified in law. Marriage between men and women is fundamental in America. That citizens and courts erroneously denied that right to interracial couples says absolutely nothing about homosexual marriage. Nothing at all.