Although the vast majority of mankind believes in a creator or Supreme Being, their concepts vary.

Islam, in the Quran, affirms the existence and Oneness of the creator and describes him as having the most perfect attributes thus enabling man to have the proper concept of him and to establish a strong bond with him based on the understanding of his sublime attributes. But the influence of philosophy and other ideas that are alien to God existence led to the emergence of distorted concepts about God (Alaah).

(Yea, the same that) has made for you the earth (like a carpet) spread out, and has made for you roads (and channels) therein, in order that ye may find guidance (on the way);That sends down (from time to time) rain from the sky in due measure;- and We raise to life therewith a land that is dead; even so will ye be raised (from the dead);-That has created pairs in all things, and has made for you ships and cattle on which ye ride, In order that ye may sit firm and square on their backs, and when so seated, ye may celebrate the (kind) favor of your Lord, and say, "Glory to Him Who has subjected these to our (use), for we could never have accomplished this (by ourselves),

(Qur’an 43: 10-13)

Should be legalized, we facing emplacing in our society by monogamy , there is thing more important is how to keep our moral and modest in high level , I think the best way is polygamy , I ll give some examples , medically that male are more capable of being infected by disease cause male immune system is weak on deliberation time and female immune system is not, which resulted more death on male side , this is why the number of female more than male , if all males get married with one female the number of unmarried female will be more high , the solution for it is the unmarried female should get married with married male or to become public property