Engagment, - Dought & clear, - * Her fiancé does not pray and deals with riba. Should she go ahead with the wedding?

I have become engaged to a young man who is of good character as far
as I know, and he told me that he never misses prayers. But after we
got engaged I found out that he does miss some prayers and fasts, and
that he puts his money in a bank with riba (interest). But he tells me
that he chose me to help him get rid of his bad deeds and sins,
because he saw that I am religiously committed and I dress properly.
Now I am wondering how I can help him with his religious commitment,
and whether there will be any sin on me if I marry this person because
I know that the one who does not pray is a kaafir. I thought of
leaving him but the most hated of permissible things in the sight of
Allaah is divorce. Now I have been engaged for a year and I have not
been able to change anything in him, and I cannot leave him, and I do
not think that I can live with anyone else. His is a good person but I
do not know what to do. Please help me, may Allaah reward you with
good.
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Praise be to Allaah.
The one who does not pray at all is a kaafir as you mention, whether
he does not pray because he denies that prayer is obligatory or
because he is lazy. This is according to the more correct of the two
scholarly opinions. Some of the scholars even said that one who delays
an obligatory prayer until its time is over is a kaafir.
It says inFataawa al-Lajnah al-Daa'imah(6/30) concerning the case of a
woman who delays the prayers until their time is over and encourages
her grown-up and small daughters to do likewise:
"If her situation is as described, then she is an apostate who is
corrupting her daughters and the daughters of her husband. She should
be asked to repent, and if she repents and reforms, then praise be to
Allaah. But if she persists in that, then her case should be referred
to the ruler to separate her from her husband, and the hadd punishment
should be carried out on her, namely execution, because of the hadeeth
of Ibn 'Abbaas (may Allaah be pleased with him) who said that the
Prophet (peace and blessings of Allaah be upon him) said: "Whoever
changes his religion, kill him." This is if she delays the prayers
until their time is over, such as delaying 'Asr until the sun goes
down, or delaying Fajr until the sun rises, because delaying them
until the time is over with no legitimate shar'i excuse comes under
the same ruling as not praying."
Based on this, it is not permissible for you to marry this young man
no matter how nice his character. What good character can be left
after abandoning prayer and dealing in riba?!
So long as he has not repented from that and the signs of
righteousness have not appeared in him, then you should reject his
proposal of marriage. If the marriage contract has already been done
then you should tell him that the contract is not valid because he
does not pray and it is not permissible for a Muslim woman to marry a
kaafir. But if he repents and prays regularly on time, then you must
make a new marriage contract with him, because the first contract was
not valid.
Do not be deceived by his words and promises. If he does not keep his
word during the engagement period, then do not expect him to keep his
word after that.
Your saying that you cannot leave him is a trick of the Shaytaan.
Rather you can do that, by putting your trust in Allaah and seeking
what is with Him, and because of your fear of falling into that which
is haraam. It is not right for a kaafir to be the husband of a Muslim
woman under any circumstances.
It seems from your question that the marriage contract has been done,
because you say that the most hated of permissible things in the sight
of Allaah is divorce, but at the end of your question you mention
engagement. If the marriage contract has not yet been done, then we
would remind you that the fiancé is a non-mahram for his fiancée and
it is not permissible for him to be alone with her or to see any part
of her, or for her to speak to him in an alluring voice or to speak to
him needlessly. All that is permissible at the time of engagement is
for him to see of her that which will encourage him to marry her,
without being alone with her.
The best advice we can give you is to fear Allaah in private and in
public, and to pray to Allaah to bless you with a good and righteous
husband.
And Allaah knows best.