Akenaton, it is precisely to provide safety and security for children that polygamy has been accepted in many societies, including the Hebrew societies of the Old Testament period. Marriage was more about those two things (women wanting safety and security for themselves and their children) than love until really quite recently.

Polyandry is less common, though it is hard to see why exactly, since a woman with multiple husbands would logically be more secure still, but I think other factors come into play in that one.

I will state that I am a Christian and take the whole Bible seriously (if not literally always), and I have not found any outright condemnation of polygamy anywhere, nor any clear promotion of so-called "traditional" marriage either (there are a few texts in the NT that would prohibit polygamous men and women from certain "offices" if taken literally, but no direct condemnation). There is, of course, much about fidelity and divorce, but that is another matter.