She is dating a Christian man and he has promised to become Muslim and marry her

Question

Praise be to Allah.

First of all, allow us to remind
you of something that you neglected in your question, and it seems that you
are also neglecting it in your life, whilst you are continuing with this
behaviour and are far away from a good environment and a society that
reminds you of Allah, may He be glorified and exalted. This thing is the
fact that your dating your boyfriend is haram, and it is haram to be in
contact with a man in a love relationship outside of a legitimate marriage,
regardless of whether that man is a Muslim, a Christian or anything else.
Undoubtedly the sin and shame are greater if the man is a disbeliever,
because in the case of a Muslim there is the hope that you may get married
to him, but in the case of a disbeliever, that is nothing but wishes and the
deceit of the Shaytaan who makes these things seem good.

This kind of relationship will
either involve haram acts – Allah forbid – or it will be a path that leads
to them. The Shaytaan lies in wait for man and seeks to lead him astray, and
the human soul is inclined to follow whims and desires. No man is ever alone
with a woman but the Shaytaan is the third one present. Allah, may He be
glorified and exalted, says (interpretation of the meaning):

“O you who believe! Follow not
the footsteps of Shaitan (Satan). And whosoever follows the footsteps of
Shaitan (Satan), then, verily he commands Al-Fahsha (i.e. to commit
indecency (illegal sexual intercourse, etc.)), and Al-Munkar (disbelief and
polytheism (i.e. to do evil and wicked deeds; to speak or to do what is
forbidden in Islam, etc.)). And had it not been for the Grace of Allah and
His Mercy on you, not one of you would ever have been pure from sins. But
Allah purifies (guides to Islam) whom He wills, and Allah is All-Hearer,
All-Knower”

[an-Noor 24:21].

You have asked for our opinion,
not on the basis of our personal opinions, but on the basis of our
understanding of what Allah loves and is pleased with, and what is taught by
the religion of Islam which we all follow, praise be to Allah, and which we
believe is the way to happiness in this world and the Hereafter.

We will give you sincere advice,
as you would expect, by Allah’s leave. We say to you: marrying a Christian
is definitely forbidden in our religion, and it is one of the most
reprehensible deed that a Muslim women could do. That is not marriage in any
way whatsoever; rather it is pure sin and a great evil, as Allah, may He be
glorified and exalted, says (interpretation of the meaning):

“then if you ascertain that they
are true believers, send them not back to the disbelievers, they are not
lawful (wives) for the disbelievers nor are the disbelievers lawful
(husbands) for them”

[al-Mumtahinah 60:10].

The prohibition is not limited
to a case where you fear that he may make you enter his religion, rather
even if he promises you that he will become Muslim, it is not permissible to
rely on his promise; rather it is essential that he actually does enter
Islam out of a genuine wish to follow this religion and believing that it is
sound, and it is essential that he becomes a sincere Muslim – all of that
should come before doing the marriage contract.

Without that, we do not think
there is any confusion regarding your question; rather the matter is quite
clear. What you must do is repent from what has happened in the past of this
haraam relationship. Allah, may He be glorified and exalted, loves those who
repent and He loves those who purify themselves. If the Muslim is faced with
a choice between what is halaal and what is haraam, and he chooses what is
haraam, then he has no one to blame but himself, and he will see the
consequences of that in this world before the Hereafter. But if he chooses
what is halaal, and seeks reward for his patience and perseverance with
Allah, may He be glorified, Allah will reward him, by His leave.

Being guided and helped (to make
the right choice) is in the hand of Allah, may He be glorified. All that the
individual is required to do is take appropriate measures and weigh things
up by examining them rationally. It is essential to ask about the situation
of that Muslim who has proposed marriage to you, and what he has of
religious commitment and good characteristics that make him suitable to be
able to treat all his wives equitably. What you mentioned, about him only
having married his first wife recently, is not an impediment to marrying him
if he is suitable for marriage, and it is not an excuse. Moreover, you have
no excuse for giving precedence to the haraam relationship over him, or for
waiting for a long time with no guarantee. Plural marriage in Islam does not
require waiting for a specific length of time between one wife and another,
or a specific age; rather the matter depends on the wishes of each partner
and their compatibility.

Pray istikhaarah, asking Allah,
may He be exalted, for guidance as to whether you should agree to this
marriage, and ask Him to make it easy if it will lead to your happiness;
otherwise it is better that it be diverted from you by His protection.

As for the first relationship
with a non-Muslim, it is not permissible to pray istikhaarah concerning it,
because istikhaarah can only be done with regard to things that are
permissible, not things that are haraam. So you must immediately cut off all
ties with him and get rid of everything that may remind you of him or pull
you back into that relationship.

For more information, please see
fatwas no. 100148 and 99264

And Allah knows best.