Like all of God’s institutions – in civil, church, and family life, marriage outside of God’s LawWord has failure built in. We must live theonomic lives to be blessed by God.
What is amazing about our society’s divorce rate is that it is not higher considering the near universal hostility to any overt proclamation of God LawWord as such. We must still be coasting on the faithfulness of earlier generations.
Since God’s LawWord as our source of morality (i.e. theonomy) is the mediator between man and man, it is required for smooth low-friction relationships within marriage. When there is more than one wife in a marriage we would expect the necessity for theonomy to be even greater since there are even more relationships involved, and it is. Non-theonomic cultures which practice polygyny are only able to maintain such marriages by arranging “multiple-monogamy” living arrangements and/or the most tyrannical authoritarianism. It is the latter that makes for some strong anti-polygyny feelings among some. They attribute the horrors of man-made tyrannical authoritarianism to polygyny rather than to antinomianism (being at war with God’s Law).
Thus we do not advocate polygyny as such, but Biblical theonomy with marriage that is potentially polygynous.