Her brother’s wife mistreats her because she is religiously-committed and she hates her
Question

                I am an eighteen-year-old girl, and my problem is that my brother’s wife always mistreats me. When my sister asked her why she does that, she said “Because she does not like religious people”! 

What she means is that I am religiously committed, hence she does not like me. I have suffered so much from her bad treatment that when she visits us I greet her then I go and sit in my room until she had left, because if I sit with her, she starts to insult those who are religiously-committed, with the intention of offending me. When I try to advise her she looks at me scornfully and in a mocking manner, then she goes away. Recently she does not want to speak to me at all. Is it permissible for me to treat her in like manner, i.e., not speaking to her at all – knowing that I have tried to advise her on numerous occasions but she just becomes more stubborn? One of my committed sisters advised me to keep away from my brother’s wife as much as possible because she only prays rarely and she often insults those who are religiously-committed. Now I am confused and I hope that you can advise me as to the best way to deal with this problem.
Praise be to Allah.
    Firstly: 

    With regard to one who does not pray, we have explained the 
    ruling on that, and stated that some of the scholars – who expressed the 
    correct view – have ruled that such a person is a kaafir and it is not 
    permissible to marry such a person or to remain married to him, and that 
    meat slaughtered by him is haraam, and so on. We have discussed these 
    rulings in detail. Please see questions no.
    34795 and
    20059. 

    Secondly: 

    With regard to your brother’s wife making fun of those who 
    are religiously-committed and insulting them and mocking them, she should 
    understand that by doing these things she is in serious danger, and that 
    these actions may put her beyond the pale of Islam. 

    Shaykh Ibn ‘Uthaymeen (may Allaah have mercy on him) was 
    asked about the ruling on making fun of those who adhere to the commandments 
    of Allaah and His Messenger  (peace and blessings of Allaah be upon 
    him)? 

    He replied: Making fun of those who adhere to the 
    commandments of Allaah and His Messenger  (peace and blessings of Allaah 
    be upon him) because of their commitment is haraam and is very dangerous and 
    serious, because there is the fear that his hatred for them may be based on 
    hatred of what they are adhering to, namely the religion of Allaah. In that 
    case mocking them is mocking the path that they are following. They are like 
    those of whom Allaah says (interpretation of the meaning): 
“If you ask them (about 
    this), they declare: ‘We were only talking idly and joking.’ Say: ‘Was it at 
    Allaah, and His Ayaat (proofs, evidences, verses, lessons, signs, 
    revelations, etc.) and His Messenger that you were mocking?”

    Make no excuse; you disbelieved after you had believed’”

    [al-Tawbah 9:65-66]

    These words were revealed concerning some of the hypocrites 
    who said: “We have never seen anything like these reciters – meaning the 
    Messenger of Allaah  (peace and blessings of Allaah be upon him) and his 
    companions – they are the most greedy, the most false of speech and the most 
    cowardly in battle.” Then Allaah revealed this verse concerning them.  

    Those who make fun of the followers of truth because they are 
    religiously-committed should beware, for Allaah says (interpretation of the 
    meaning): 

    “Verily, (during the worldly life) those who committed 
    crimes used to laugh at those who believed.

    30. And, whenever they passed by them, used to wink one to 
    another (in mockery).

    31. And when they returned to their own people, they would 
    return jesting;

    32. And when they saw them, they said: ‘Verily, these have 
    indeed gone astray!’

    33. But they (disbelievers, sinners) had not been sent as 
    watchers over them (the believers).

    34. But this Day (the Day of Resurrection) those who 
    believe will laugh at the disbelievers

    35. On (high) thrones, looking (at all things).

    36. Are not the disbelievers paid (fully) for what they 
    used to do?”

    [al-Mutaffifeen 83:29-36]

    Majmoo’ Fataawa al-Shaykh Ibn ‘Uthaymeen, 
    2/question no. 236. 
Insulting a Muslim is a 
    major sin, especially if one insults him for being religiously committed and 
    righteous. There is the fear that the one who does this may fall into 
    apostasy as stated above with regard to mocking them. 

    It was narrated from ‘Abd-Allaah ibn Mas’ood (may Allaah be 
    pleased with him) that the Prophet  (peace and blessings of Allaah be 
    upon him) said: “Insulting a Muslim is immorality and killing him is kufr.” 

    Narrated by al-Bukhaari, 48; Muslim, 64. 

    Al-Nawawi said: 

    In Arabic the word sabb (translated here as insulting) 
    means slandering a person and speaking of his honour in a disparaging 
    fashion. And fisq (translated here as immorality) means going out; in 
    sharee’ah terminology it means going out of obedience (i.e., transgressing 
    the bounds of obedience). 

    With regard to the meaning of the hadeeth: Insulting a Muslim 
    for no reason is haraam according to the consensus of the ummah, so the one 
    who does that is a faasiq as the Prophet  (peace and blessings of Allaah 
    be upon him) said. 

    Sharh Muslim, 2/53, 54. 
We advise you to 
    continue advising her, and if that is via your brother, that will be better. 
    Tell him of the Islamic rulings on what she is doing, and encourage him to 
    guide her by whatever means he can. 

    We do not advise you to sit with her unless she repents and 
    turns back to her Lord. We fear that you may react towards her, and we fear 
    that she may increase in sin every time she sees you or sits with you. 

    Allaah says (interpretation of the meaning): 

    “And when you (Muhammad) see those who engage in a false 
    conversation about Our Verses (of the Qur’aan) by mocking at them, stay away 
    from them till they turn to another topic. And if Shaytaan (Satan) causes 
    you to forget, then after the remembrance sit not you in the company of 
    those people who are the Zaalimoon (polytheists and wrongdoers)”

    [al-An’aam 6:68]
But if you speak to her 
    and do not shun her, that may be more beneficial for her because it may 
    soften her heart. You can limit it to greeting and welcoming her, and asking 
    how she is, without indulging in any arguments with her that may lead her to 
    do something haraam. 

    Do not forget – as well as doing what you can to advise her – 
    to pray that she may be guided aright. 

    And Allaah knows best.