Ruling on the wife of one who reviles religion
Question

                I heard that if a man reviles religion, his wife becomes divorced from him, and he has to repent, seek forgiveness and do a new marriage contract. How true is this?.
Praise be to Allah.
      Reviling religion is apostasy from Islam. The same applies 
      to reviling the Qur’aan or the Messenger (blessings and peace of Allah be 
      upon him): it is apostasy from Islam, and kufr (disbelief) after faith - 
      we seek refuge with Allah. But it does not mean that the wife is divorced 
      (talaaq); rather they should be separated without divorce. It cannot be 
      divorce; rather she becomes haraam for him because she is a Muslim woman 
      whereas he is a kaafir, and she remains haraam for him until he repents. 
      If he repents and her ‘iddah has not yet ended, she goes back to him 
      without any need for anything, i.e., if he repents and turns back to 
      Allah, she goes back to him. But if her ‘iddah has ended and he has not 
      repented, then she may marry whomever she wants. That is like a divorce 
      but it is not a divorce (talaaq); rather it is like divorce because Allah 
      has forbidden Muslim women for kaafir men. 

    If he repents after the ‘iddah has ended and he wants to 
    (re)marry her, there is nothing wrong with that, but it should be done with 
    a new marriage contract, so as to be on the safe side and avoid an area 
    concerning which the scholars differed. Some scholars think that she is 
    permissible for him without a new marriage contract: if she chose him and 
    did not marry anyone else after the ‘iddah ended, she remains as she was 
    (i.e., still married). However, the majority say that when the ‘iddah ends, 
    she becomes irrevocably divorced from him and becomes a non-mahram to him, 
    and she cannot become permissible for him except with a new marriage 
    contract. So it is better and more on the safe side to do a new marriage 
    contract. This applies if the ‘iddah ended before he repented. But if he 
    repents before the ‘iddah ends, then she is still his wife, because the 
    Prophet (blessings and peace of Allah be upon him) accepted the marriage 
    contracts of men who became Muslim after their wives did, before the wives’ 
    ‘iddahs ended. End quote. 

    Shaykh ‘Abd al-‘Azeez ibn Baaz (may Allah have mercy on him)