VV76, delete this if it leads the thread too far astray, or if it's too far off by itself, but just a quick one on Lev 5:4 (h/t to EternalDreamer for getting me to focus on this over the weekend)....
Lev 5:2 You are guilty and unfit to worship me, if you accidentally touch the dead body of any kind of unclean animal.
Lev 5:3 You are guilty if you find out that you have accidentally touched any waste that comes from a human body.
Lev 5:4 You are guilty the moment you realize that you have made a hasty promise to do something good or bad.
Lev 5:5 As soon as you discover that you have committed any of these sins, you must confess what you have done.
Lev 5:6 Then you must bring a female sheep or goat to me as the price for your sin. A priest will sacrifice the animal, and you will be forgiven.
That's the Contemporary English Version. If someone wants to roll out a different translation, go for it and we can have that discussion, but I chose this one for its direct language. (Note though, that I think other translations that read "foolish promise" or "rash promise" are more what we're talking about with marriage vows.)
The foolish vow thing is part of a set of actions that would permanently defile someone if there were not a remedy, and that remedy is confession and forgiveness. The implication seems to be pretty clear to me (seems, pretty, to me - a triple qualification) that the confession and forgiveness neutralizes the effect of the sin; in the case of vows, it would absolve the hasty/foolish/rash vower of the obligation to keep the vow (or else it doesn't really 'fix' the situation).
Somebody's going to spiritualize away the forgiveness part with something like "you can be forgiven for what you did and still have to pay the penalty". I would ask that person to come back later after doing a word study on the concept of "forgiveness" and considering how we may have screwed up that word in our modern culture.
In any event, if I were discussing the monogamous vows we assumed were legit when we were younger and whether they are binding on us once we realize they are
not legit from a biblical perspective, this is the passage I'd start with. The decision to trust one's church leaders and parents and cultural thought leaders on the legitimacy of appropriate vows for instituting a marriage, instead of somehow deciding to do a massive research project on God's standards on the hunch that maybe you're being misled, could appropriately be described as a rash or foolish vow, for which God has provided a remedy so long as one takes appropriate steps of confession and repentance upon discovery. Makes sense to me.