DN4- psalm 137- the bible as you know if you have studied it, is instructional in part, historical, poetic and symbolic in others, it in parts illustrates human nature in its goodness and also its brutality.
The part you refer to is written from the perspective of a persecuted Jew. It's not instructional, it's a reflection of the psalmist feelings on those that have done evil can expect it be returned. It's tone is mournful. The language is shocking because it's indented to strike the reader with the consequence of evil. It's not saying this is ethical, it's more prophetic in nature.
Jesus said there will be many false prophets and fake christians- not everyone calling on my name will be getting into heaven- I will say I don't know you, get away from me evil one. He said you will know the real ones by the good works that they do... the fruit they produce. He warns about the wolves in sheeps clothing.
As for other churches forcing marriage, condoning rape- I haven't heard of this. What I can say is that christians are currently the most persecuted group in the world- - there are recent cases where women are raped, eyes have been gauged out and all manor of terrible things happening to them and strangely silence from msm on the issue. Do a little digging and you will uncover just how bad it's getting.
You ask- you really think a more Christian society would have stopped the issues with TRAs or polyamory?
Yes I do, it's been foundational to our society, it's defined our laws and kept us relatively stable.
As CS Lewis said it's all well and good seeing through things, so long as you see something the other side. Well I don't see secular humanists coming up with anything decent that, as another poster said, that everyone subscribes to. There's nothing underpinning secular values, they can be changed at whim so the foundations can be easily rocked. All we are replacing values with is hedonism and individualism. The self above all else.
"You remove the organ and demand the function, you mock virtue and are surprised when traitors are in your midst"
Trotsky- We'll have nothing of the Papist-Quaker babble about the sanctity of human life"-
If life has an no inherent value, and why would it without believing in any higher purpose- that makes you and I disposable, collateral damage in the pursuit of the goal. It makes humans worthless.
The bible says that Christian persecution will increase- and it is- Jesus said that in the end they will hand you over to death. He reminds us that they hated him first.
Times are set to get worse- they will reject the truth and turn unto fables, they won't listen to the truth, becoming selfish, lacking natural affection.
I think by rejecting truth- depending on moral relativism- things will get worse I'm sure. Everything will get turned on it's head.
The battle between good and evil, I think is very much on.