His wife became Muslim but he hurts her and mistreats her
Question

                A man traveled to Europe, married a Christian woman and had a daughter from her to get residency. He lived the first years in secrecy. He used to harm his wife and daughter like if they were not his family. His wife converted to Islam after Allah guided her. But he still hasn’t changed. He is sinful and commits adultery, nor does he spend on his family. He forcibly takes his wife’s money, and she is patient despite his unfairness, as she has other children and wants to protect her family, wishing that Allah guides him one day.  

This woman’s family thinks that the reason behind all the problems she meets is Islam and foreigners. May you please advise this man so that he may return to the straight path? And what is the ruling of Islam on this?.
Praise be to Allah.
    We praise Allaah for having guided this sister to Islam and 
    we ask Him to make her steadfast in adhering to the truth, and to guide her 
    to the right words and deeds. 

    What the sister has mentioned is an example of how Islam is 
    suffering at the hands of its people – if we may put it this way – people 
    who claim to be Muslim, then they go against the rulings and etiquette of 
    Islam. Moreover, if this transgression happened in a Muslim country, where 
    Islam is prevalent and those who are committed to the faith are known, then 
    no one would be blamed for someone else’s mistakes, and no one would condemn 
    Islam because of the bad deeds of an evildoer. In that case the matter 
    wouldn’t be so bad. But the problem becomes worse when one of these 
    evildoers lives in the west, among the kuffaar, and they regard him as a 
    representative of Islam and of its morals, etiquette and rulings, then he 
    lives his life like the Jews and Christians around him, not paying any 
    attention to what is halaal and haraam. 

    Al-Awzaa’i (may Allaah have mercy on him) said: It was said 
    that there is no Muslim who is not standing guard on the borders of Islam, 
    so whoever can prevent Islam from being undermined or attacked, let him do 
    so. 

    Al-Hasan ibn Hayy (may Allaah have mercy on him) said: With 
    regard to Islam, the Muslims are like a fortress. If a Muslim does a bad 
    deed, Islam is breached from his direction; if all the Muslims do bad deeds, 
    you should persevere in adhering to that which, if all the people were 
    united on it, the religion of Islam would prevail, that which Allaah wants 
    for all people, and do not let Islam be breached from your direction. 

    Al-Sunnah by Muhammad ibn Nasr 
    al-Marwazi (no. 29, 30). 

    It hurts every Muslim to hear that Muslim sisters who have 
    entered Islam recently are exposed to verbal and physical harm by those who 
    are supposed to be a good example of Islam and of the Muslim family which 
    should be distinguished by stability, love and compassion among its members. 
    It is regrettable that among those who claim to belong to Islam there should 
    be someone like this husband who sets a bad example and puts people off 
    Islam, and who causes the image of Islam to be distorted, which leads people 
    to criticize it. 

    If one of the things that this husband does is to neglect the 
    prayer, then the sister should realize that it is not permissible for her to 
    stay with him, because not praying is regarded in sharee’ah as kufr which 
    puts one beyond the pale of Islam, hence the marriage contract is rendered 
    invalid. A person like this husband is not fit to be the head of a family in 
    which he is entrusted with his wife and children, rather there is the fear 
    that he may harm them by his bad actions. If he does not spend on them as 
    enjoined by Allaah, then he has combined all kinds of evil in his actions 
    and attitude, and staying with him is a heavy burden that the wife is 
    shouldering for no reason; if she rids herself of him by means of divorce or 
    separation, that will be better for her and perhaps her life will change for 
    the better, either on her own with her children or with another husband who 
    understands the value of family and fulfils the duty that Allaah has 
    enjoined upon him. 

    If this sister hopes that her husband will be guided and set 
    straight, then she should strive to achieve that through his friends or 
    relatives who may be able to have some effect on him and guide him. She can 
    also make use of audio and video tapes which contain exhortations and 
    warnings against committing sin, and remind one of death, the grave and the 
    reckoning. Perhaps that will influence him and bring him back to his Lord, 
    may He be glorified and exalted. 

    If that does not do any good, then she should not hesitate to 
    refer her case to a Muslim judge or mufti, or the imam of a mosque whose 
    knowledge and religion commitment she trusts, to help her to get rid of him. 
    If she cannot do that, then she should refer the matter to judicial or state 
    institutions that take care of family matters. If he does not pray, then her 
    marriage is null and void, and if he commits those sins although he also 
    prays, then she should pursue shar’i means of freeing herself from him 
    through a scholar or seeker of knowledge or an Islamic centre, to oblige him 
    to spend on his family and give up sins and evil actions. If he refuses then 
    they should divorce her from him in accordance with sharee’ah, and after 
    that she should divorce him officially so that he will no longer be regarded 
    as her husband. 

    This sister should strive to move to a  Muslim country 
    because that – even though there may be things there that go against 
    sharee’ah – is better than the land of kufr and permissiveness, where the 
    Muslim cannot find safety for himself and his children. 

    We ask Allaah to increase her reward and to guide her and her 
    children, and help them to do that which pleases Him. 

    And Allaah knows best.