Governing persons in any society get their authority from God. That is to say, they have no authority, and cannot have any authority, EXCEPT... to enforce God's law, and to obey Him in everything, and to make it as easy as possible for their subjects to do the same.
Whenever a leader of a country "okays" sins, approves some sin... that is against God. That leader has no authority whatsoever, for instance, to say abortion is legal. That is a grave sin on the part of the governing person, and it produces a law which no person faithful to God can follow, because that person had no authority to say it is "all right".
This is true of any such sin (like abortion or birth control) which are things the government COULD forbid and do it's best to enforce. Saying that the government could not possibly stop people from doing those things, or saying people will do them anyhow, and might get hurt trying to do them illegally, is like saying you will not stop all robbers, and therefore it should be legal for everyone to rob anyone they want. Or that robbery should be all right, as long as the robber personally feels that he or she "needs" to commit the crime. We would not say this about MOST crimes... but when it comes to divorce, abortion, adultery, porn, prostitution and so on, our governments have become willing to adopt a totally wrong and totally unjust position (in the eyes of God) which they have absolutely no authority to enforce or approve. It is like saying they are going to use authority that is from God, and which is only binding when it operates FOR God (eg, according to HIS laws), to DEFY God. It is insane, and wrong.
The fact is, like it or not, God really, truly IS the Author and "force" of all authority on earth. Authority is said to be "just" (or binding) whenever it is in line with, or does not oppose the laws of God. Authority has NO binding power before God, if the person who holds it attempts to impose or encourage something that is against God or His laws. This is the REALITY of authority. Of course you can still be thrown into jail or whatever if you break a sinful, unethical law... but in terms of our souls, such laws are not binding because it would be sinful for us to follow them. (You'd be choosing hell over jail, and offending God over offending men.)
Since authority is only God's, and men can only possess real and just authority if they uphold God's interests and laws, then a governing person should never decree that any sin is "all right" or pass any laws that encourage sins, or command us to commit them, because such laws and decrees are NOT binding in the eyes of God, but contrary to Him, and we are bound to disobey them where it would mean the commission of sin ourselves.
While we MAY submit to unjust laws like being taxed to death, we may not submit to laws that command us personally to sin. And governing persons have no right or authority to pass any law that is sinful, or that encourages sins.
Societies should absolutely, on the other hand, encourage virtue and true holiness (true obedience to the One, True God) by it's laws and so forth, and by protecting the common man from undue exposure to things that would lead him into sin, such as prostitution or porn. (True) churches should be encouraged by laws and other helps to flourish and the One, True religion MUST be (if at all possible) the one and only religion of the state, because it is God's religion, from whence the only real authority comes from, and because Christ is truly King, whether or not these men "will not have him to rule over them".
Since the only true authority any men on earth possesses comes from God, it is only rational that those same men must acknowledge the True King, Jesus Christ. The fact of His Divine Kingship does not change simply because men deny it. But those rulers who go along with denying it, when they should be it's fiercest defenders and supporters, will be accountable for anything they could have done or implemented in it's favor, and didn't.
We can't deny that Christ is King, because He simply is. And there is no authority upon earth, except authority that is ratified by God. Who are men, that they have power over other men? Or what gives them this power? All men being equal before God, none of them have a right to just take over things, least of all if it's to fly in the face of God's laws. Actual or real authority can only come from above.
A ruler is a maker of laws, but there is one Divine Lawmaker whose laws cannot (must not) be violated or erased or changed or ignored by any man on earth. Authority exists among men, pretty much only to speak for that Divine King in all matters that society faces.
Sadly, the reality has been pretty much universally ignored at this point. If people would look in the Bible, however, they would see what happened to those wicked men who would not have their rightful king to rule over them.
Of course, I'm not condoning lawlessness, or open defiance of any authority figure. We must obey where possible, and where it is not sinful for us to do so. If at all possible without offending God, we usually must obey.