As stated in the first part, Islam brought about reforms in the customs previous nations, including Arabs, had in practicing polygamy in Islam:

The Limitation in the Polygamy in Islam

The first reform Islam enforced was the restriction it imposed upon polygamy. Before the advent of Islam, there was no limit to the number of wives. One man could keep hundreds of wives and thus establish a harem for them, just as the ones some kings had, which is strictly banned in the religion of Islam.

However, Islam put a maximum limit on their number, and an individual was not allowed to have more than four wives simultaneously.

Justice:

The other reform that was made upon polygamy in Islam was the condition under which there must never be, for any reason, discrimination between the wives or their children. The Holy Quran explicitly commands:

"But if you fear that you may not treat them fairly, then [marry only] one" (4:3)

As a matter of fact, those men who can observe full justice with a number of wives are very few. It is clearly stated in the following verse of the Quran which is in association with the previous verse:

"you will not be able to be fair between wives, even if you are eager to do so..." (4:129)

Allah explains here that justice between the wives in its true sense - to stand exactly in the middle of the extremes - is beyond human power even if one may wish it. What a man is obliged to do is that he should not be totally inclined to one of them, leaving the other one as she were in suspense… [1].

Other conditions for Polygamy in Islam

Besides these two main restrictions, there are other responsibilities and duties polygamous men have to fulfill toward all their wives; such as Nafaqah (alimony) and Mahrieh (marriage portion), etc. [see the article about the rights of the wife over her husband]

The Best Form of Marriage in Islam

Ultimately, there is no dispute about the fact that monogamy is better; it is actually the best and most natural form of marriage in Islam. Obviously, the spirit of marital life which is oneness and unity is attained better and with more perfection with a single spouse.

It is only within this form of marriage that family commitment makes sense, and the great bond that unites the hearts of husband and wife makes them become one soul and one flesh [2].

Polygamy in Islam, on the other hand, rises from a social problem that rests heavily on the shoulders of all men and married women and for which a better solution has not yet been found. We have to face the fact that monogamy is not practical in specific social circumstances, and polygamy -under the mentioned conditions- is the most significant saving factor for monogamy.

A Choice between Conflicting Alternatives

One of two alternatives should be chosen: either the restricted acceptance of polygamy -as a duty rather than pleasure-, or the love affairs system, which is common in some societies these days. In other words, a few married men should marry more than one wife -of course under the condition of fulfilling all the above-mentioned responsibilities of a husband in a polygamous family-, and these will certainly not exceed a few percents, and unmarried women should settle, get home and make a life for themselves; or else open the way for love affairs.

In the case of the second alternative, the women deprived of family life may associate at her own free will with several men, and, as a result, almost all married men will in practice be polygamists.

Even then the matter will not end. The wives who will find their husbands to be unfaithful will think of taking revenge upon them and thus will themselves become unfaithful. This final result has been summarized in the well-known Kinsey report in one sentence: “The men and women of America have surpassed all other nations in unfaithfulness” [3].

Now, which alternative do you think is better?

References:

1. polygamy
2. Morteza Motahari, women and her rights in Islam, p. 148
3. Morteza Motahari, women and her rights in Islam, p. 150
4. polygamy in islam

One of the motivations of those who convert to Islam may be marrying someone who is a Muslim. In Islam, marriage is a sacred and dear institution to Allah, and it plays a very crucial role in the formation of an ideal society. It is in fact, considered one of the greatest Divine blessings for responding to the natural instincts of human beings. However, according to the Islamic teachings, faith is the first quality to be considered in choosing a spouse.

A faithful and harmonious partner plays a crucial role in having a prosperous life. It is on this basis that the Quran, the Holy Prophet (PBUH&HP) and his Ahl al-Bayt (AS) have laid great emphasis on religion and well mannerism as necessary criteria for marriage.

Meanwhile, an important question that comes to mind is that, “can we convert to Islam for the sake of marriage or not?”

The Highest Goal of Islamic Marriage

Marriage is a natural necessity for every human being and several good outcomes such as procreation, sexual satisfaction, peace of mind, etc. are considered as the purposes of marriage. However, these could not be the ultimate goal of marriage in Islam as the non-Muslims can also achieve these, perhaps in better ways.

Humankind is not created solely to eat, drink, sleep, seek pleasure or act lustfully. Thus, the aim of marriage for a religious person should be a means of gaining proximity to Allah and avoiding sins. In this regards, a good and faithful partner assumes a vital role as he/she invites his/her partner to goodness, in the same way as a corrupt person would tempt his/her partner towards corruption. Islam has enjoined its adherents to consider religion and good manners as necessary criteria for the selection of their future partners on different occasions.

The Prophet (PBUH&HP) said: “If I were to bestow all the good of both worlds upon a Muslim, I would endow him with a humble heart; a tongue which continuously utters the praises of Allah; a body patient enough to withstand all calamities; and I would give him a pious spouse, who when he sees her becomes happy and protects his property as well as her own honour in his absence”.[1]

Convert to Islam for Marriage

In the Quran, it is said:

“Do not marry idolatresses until they embrace faith. A faithful slave girl is better than an idolatress, though she should impress you. And do not marry [your daughters] to idolaters until they embrace faith…” (2: 221)

From the above verse, it is clear that faith and religion is an uncompromised condition for marriage in Islam. It has explicitly prohibited marriage with the infidels except that they embrace Islam, as the statement “until they embrace faith” indicates. Thus, neither is the man allowed to marry an idolatress nor a Muslim woman is allowed to marry an idolater. However, there is a separate ruling [i] to the marriage with the people of the Book (i.e., Jews and Christians).

Meanwhile, following the Islamic jurisprudence, it is considered permissible for someone to convert to Islam for marriage, as there is not any religion hindrance on that, as far as it is based on the sincerity of intention and a strong determination to act by the Islamic teachings. Although such a conversion might not be the best idea, it might be a perfect chance to think more about converting to the real and true religion.

Conclusion

In Islam, faith and religion are crucial requirements to be considered in the choice of a future spouse. This is because the ultimate goal of a marriage is the everlasting salvation in this world and the Hereafter. And this cannot be achieved by marrying an idolatress or idolater. However, based on the verdicts of the Islamic jurists, it is acceptable to convert to Islam for the sake of marriage, so far as it is based on the sincerity of intention and a resolution to work in line with the teachings of the religion.

Note:
[i] Books on the Islamic jurisprudence or the official sites of the religious authorities should be consulted for details of the ruling.

References:

1. Hur Amuli; Wasa’il as-Shiah, Vol. 14, P. 3.