It's not only the Muslim world. It's the status of women in EVERY society where polygamy is practiced. The Muslim world is simply the most common example.
Is it? I would think that the Pahari, Ladhaki, and other Nepali would disagree strongly with this; as well as the Maasai; the Mosuo, and various Mongolian peoples; various Burmese peoples; the Nair, Theeya and Nishi people of India; and various Polynesian peoples. Not to mention all of the historical examples throughout Asia and the Middle East.
It really helps to have a bloodly clue what the hell yo'ure talking about, before spouting off. While polyandrous polygamy is not as common, historically, as polygyny, that's an accident of culture that is not directly applicable to the modern, developed world. It's an artifact of societies which have a greater female to male ratio, typically resulting from depletion of available males through warfare or monasticism. In some areas where the male to female ratio is typically higher, polyandry has often resulted. In a few societies (such as the previously mentioned Indian peoples), both polygynous and polyandrous polygamy was practiced roughly equally.
It's extremely rare that polygamy is exclusively religious in origin. In fact, when it is so, it is almost invariably among a fringe sect or cult, and limited to a charismatic leader, or small group of hierarchical "elites" playing out their harem fantasies in a religious context. It is almost invariably limited to a handful of people, and rarely persists long (and is often a bone of contention within the group). The Mormon practice of religiously mandated polygyny is a historical anomaly resulting entirely from the self-indulgences of such an elite leadership. Other religious examples, such as those in Judaism or Islam, are merely a recognition and codification of issues involved with existing population ratios, rather than any desire on the part of the leadership or practitioners.
In modern polyamourous subcultures, polygynous and polyandrous relationships are practiced more or less equally as well; although these often ivolve far more complex relationship groups than traditional polygamous marriage practices.
Your insistence on repeating something that is provably and obviously completely wrong makes you look like an idiot, which you clearly are not from your other posts; and a bigot, which I'm disappointed to see you demonstrating yourself to be.