It is? You want to tell God that?
Man’s law has no effect on God’s law. Everyone will have to account for themself before God. However, as a political matter in the US - no state that has gay marriage is going to get rid of it and there’s not going to be a Constitutional Amendment to ban it. The status quo will probably remain for the foreseeable future. So there’s no point in making it a campaign issue on a national level.