The solution to this is to push recognition of polygamy as being constitutionally required by Obergefell. Then do incest. The point is to so screw up civil marriage it no longer functions. Then people will see the value of the traditional one man, one woman marriage and perhaps we can then get a constitutional amendment. It will take 20 years, but in the meantime, they will be so busy dealing with the repercussion that they won’t be able to focus on eliminating the Christians, and Christians can keep on having Christian marriages while ignoring the chaos of civil marriage.
The solution to this is to push recognition of polygamy as being constitutionally required by Obergefell. Then do incest.
Whatever else the Obergefell crowd may be, they are not stupid...which is why you will not see any push to regularize polygamy or incest, because they know that is a bridge too far...