You need to study a bit of history. Polyamory has existed since time immemorial. It’s in the Old Testament. Look it up.
So hasn’t human sacrifice. You don’t get that God created morality and that is the difference between our points of view. If you want to bring back every kind of corruption that has ever existed just because they did it too then you have no concept of the insanity that you are bringing about on society. You have enjoyed the benefits of living in a fairly sane society up to now but that is about to change. Your children, if you ever will have any will not have the benefits that we have enjoyed. Don’t you see how society has become increasingly disfunctional during the past 40 years? This came about with views like yours which are liberal views. In the sixties everything was questioned and now we have a society that has 50 million abortions, millions of kids born out of wedlock, a drug culture out of control and many unhappy people. Morality means something.