I think you might be confusing cause and effect. Long term serial monogamy is the norm across cultures and religions. It does not mean any other arrangements are objectively "wrong" but this meme of "Everyone would do X if not for cultural oppression!" is wrong. It's the same delusion that goes on with people who claim everyone is bisexual; it's a wish fulfillment fantasy of people who are outside the norm.
Where did you get that from? I'm not saying that, not at all.
Do I think that living and open relationship (not necessary polygamy, because the terms implies numerous relationships each with the same affective and contractual status) is the best way to go? Yes.
Does that imply that humanity, freed from the religious oppression, would go for that? Not at all. There might even be some biological bases for monogamy, but we are rational beings. We can work around our instinct. We do that all the time. Some of us can successfully do that for monogamy, too. It would be great if that could be more largely accepted.
You seem to be taking contradictory positions, or I'm misunderstanding. You think that open relationships are the best way to go. But then you say that most people wouldn't go for them if religious strictures were lifted. Are you drawing a distinction based on religion specifically versus culture overall? One would presume that worldwide, if there was no "artificial oppression", people would naturally be mostly into open relationships if that's truly the natural state.
