She loves her cousin and he has proposed to her but he does not pray apart from Jumu’ah (Friday prayer)
Question

                All praise be to Allah who guided me to pray, wear hejab and niqab. My question is about my cousin, he told me secretly that he loves me. He proposed to me but my father refuses him in spite of knowing that we love each other. He refuses the matter of marriage between relatives; also my cousin does not pray but jumu’ah, he smokes cigarettes and shisha and wastes his time sitting on cafés. He is of less status than us, financially and socially, as I am a doctor and he is a clerk, he is not religious either and his family and my father have many problems. But we love each other and I do not see my happiness in all those things, it is only with whom I love. I think it is easy for Allah to guide him as he guided me, as he is a moral man.

Shall I persist in asking my father to accept him hoping that Allah guides him after marriage, sacrificing all these differences between us, and thinking of the prophet’s (PBUH) Hadeeth: “marriage is the best for the two who love each other”?.
Praise be to Allah.If your cousin does not 
    pray apart from Jumu’ah, and he smokes the shisha and sits in coffee shops, 
    then you should not accept him, rather it is not permissible for you to 
    accept him, because if a person does not pray apart from Jumu’ah, the 
    scholars differed as to whether he is a kaafir; some of them said that he is 
    a kaafir, and some said that he is a faasiq (evildoer). At the very least he 
    is committing a major sin. 
How can a believing, 
    righteous woman whom Allaah has blessed with guidance and who has become 
    religiously committed and righteous, accept to marry a man like this?! 
As for the love to which 
    you refer, it cannot be denied that the best remedy for two who love one 
    another is marriage, but this should not be at the expense of religious 
    commitment, because love may change and disappear, and be followed by hate 
    and harm, especially if the man is heedless of the rights of Allaah. 
Marrying a man who is not 
    righteous in the hope that he may be guided in the future is a risk that 
    leads to negative consequences. He may or may not become righteous. You have 
    to imagine what your life would be like with a man who does not pray, and 
    who offends you with the stink of his smoke, and who wastes his time with 
    bad companions in the coffee house. 
A person like you is not 
    unaware of the difference between the life of religiously committed people 
    and the life of others who pray and are good in general, so how about life 
    with one who does not pray and who smokes? 
If this young man knows 
    that he has been rejected because he does not pray and he smokes, and he 
    does not mend his ways or become righteous, then the hope that he might 
    become righteous after marriage is even more farfetched. No one knows what 
    will happen tomorrow except Allaah, but this is based on general knowledge 
    of how people are. If he really wants to marry you, then he will do 
    everything he can to improve and change his image. If he does not do that, 
    then there is a strong possibility that he may stay as he is after getting 
    married. 
Hence we advise you to let 
    him know that you have rejected him because of his shortcomings and 
    negligence with regard to religion, and that the rejection did not come only 
    from your father, but it has in fact come from you too, after suppressing 
    your feelings and following the rulings of sharee’ah on this issue. If he 
    changes and becomes righteous, and that lasts long enough for you to be 
    certain that he is steadfast, then in that case you may accept his proposal, 
    and urge your father to agree.  
But if he remains as he is, 
    then stop thinking about him and remember that there are many other men who 
    are righteous. Married life is intended to last for a long time, and it 
    requires both partners to be compatible, so that their life will be good and 
    they will produce righteous offspring and build a good family. 
Happiness is not attained 
    just by getting what one wants; rather true happiness is a gift from Allaah, 
    which follows faith and righteous deeds, as Allaah says (interpretation of 
    the meaning): 
“Whoever works 
    righteousness — whether male or female — while he (or she) is a true 
    believer (of Islamic Monotheism) verily, to him We will give a good life (in 
    this world with respect, contentment and lawful provision), and We shall pay 
    them certainly a reward in proportion to the best of what they used to do 
    (i.e. Paradise in the Hereafter)”
[al-Nahl 16:97]
Hence we see many cases 
    that start with love before marriage, and end in failure and sorrow, because 
    they were not based on obedience to Allaah. 
See the answer to question 
    no. 84102 in which there is a 
    social study of this issue. 
Secondly: 
It is obvious that your 
    cousin is a non-mahram to you like any other non-mahram man, so there can be 
    no relationship between you before marriage. So he should not look, shake 
    hands, be alone with you or engage in conversation in which you speak in a 
    soft voice. Allaah says (interpretation of the meaning): 
“…be not soft in speech, 
    lest he in whose heart is a disease (of hypocrisy, or evil desire for 
    adultery) should be moved with desire, but speak in an honourable manner”
[al-Ahzaab 33:32]
We ask Allaah to guide us 
    and you. 
And Allaah knows best.