Who decides what is God's law? The Southern Baptist Conference? The Pope? The Chief Rabbi of Israel? The United Methodist Church? The Grand Mufti? The Dali Lama?
Homosexual marriage is no more Constitutional than murder is AND heterosexual marriage can no more be banned than murder can be legalized.
Different states define "murder" in very different ways. To give you just one example, if you see someone stealing your car from your driveway and you shoot him dead, that is completely legal in some states, manslaughter in others, and first-degree murder in still others. Which of those states are following the Constitution and which are not?
>> “Who decides what is God’s law?” <<
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The Word of God.
You are being obtuse. You deny the self evident forest for the arbitrary trees. There are self evident truths and inalienable rights -the Founders stated as much! Marriage is one of those truths.
You can pretend this is not so RATHER than seek to understand what you are obviously ignorant about. Whose God? You better find out -as YOUR inalienable rights are endowed by the Creator you are blind to AND unless you want to be a government endowed useful idiot piece of meat you better get busy