Ruling on the wife of one who reviles religion

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)