How does a Muslim husband protect his non-Muslim wife from the fire of Hell, given his guardianship over her, and why did Allah permit marriage to women of the Book, even though a person's salvation from the Fire is conditioned upon belief in Muhammad, peace be upon him, and the Quran?

A Muslim man marrying a chaste Christian or Jewish woman (Ahl al-Kitab) is permissible according to the Quranic text, provided that she is chaste, virtuous, believes in her religion, and her guardianship falls under her Muslim husband. If any of these conditions are not met, the marriage becomes prohibited. Despite its permissibility, it carries many potential harms, such as the wife's influence on the upbringing of the children. However, these harms do not render lawful what Allah has permitted; rather, they serve to discourage this type of marriage. Islamic law encourages choosing a Muslim woman of good character and religious commitment. It is preferable to avoid marrying a woman from the People of the Book, while acknowledging its permissibility if the conditions are met. The husband's role is to invite her to Islam through good character and treatment, and this may be part of the wisdom behind the permissibility of marrying them.