Must the wife ask her husband if he had insulted the religion on their wedding night, given that she does not remember and expects him not to remember?

The original presumption is the husband's innocence of blasphemy (sabb al-din) and the persistence of the marital bond, based on the rule: "Certainty is not removed by doubt." This means the husband has not apostatized from Islam. You are not required to search for the specific words he uttered. If a Muslim prays, he has pronounced the two testimonies (Shahadatayn) and returned to Islam. In fact, merely by his prayer, his Islam is affirmed. So, if he dies thereafter, his inheritance goes to his Muslim relatives, and he is washed, prayed over, and buried in Muslim cemeteries. We emphasize the importance of both spouses maintaining their marital life and avoiding problems, especially at the beginning of their life together.