Polygamy was a well established form of marriage for many societies throughout history.
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That didn’t make it right..
and it certainly was never Biblical..
Most of the Earth is not Christian. Only about 33% of the population of Earth is Christian. As for the remainder, a vast percentage, about 15% are Muslim who are allowed up to four wives, Today. In the past many religions and civilizations condoned polygamous marriages.
No culture in history has ever allowed same sex ‘marriage’.