What advice can be given to a wife contemplating divorce from her husband due to religious disagreements and his desertion of the faith, considering that she has children and wishes to raise them righteously?

If the husband never prays at all, he is, according to the more preponderant opinion, a disbeliever (kafir). It is not permissible for the wife to remain with him, and she must separate from him. However, if he prays sometimes and misses prayers sometimes, he is not considered a disbeliever. In this case, the wife should be patient with his ill-manners, offer him advice, pray for him, and seek the help of those who can influence him. Divorce should not be resorted to as long as there is an alternative.