What is the ruling on a Muslim man marrying a woman of the People of the Book who claims she wants to embrace Islam but does not adhere to its rituals? Is her going to the mosque considered sufficient proof of her righteousness and intention to convert to Islam? And what is the ruling on a brother insisting on marrying her despite his family's objection and their desire for a wife who conforms to their traditions?

Firstly: If girls continue to refuse your brother without reason, he should be advised to mend his relationship with Allah, for whoever mends what is between him and Allah, Allah will mend what is between him and the people.

Secondly: Regarding his insistence on marrying a girl who is close to Islam: 1. Marriage to a chaste Christian woman is permissible, but refraining from it is preferable and safer for a Muslim, out of fear that she might draw him and his offspring to her religion. 2. Your brother's marriage to her might be good for him (to keep himself chaste), and for her (perhaps it could be a reason for her to embrace Islam), and for you (to avoid a rupture in relations). 3. Instead of forcing him to marry someone he does not desire, let him experience it with the girl he wants. This might be a reason for her guidance and their rectitude, and he might need you later.

Our advice to you: Gently prevent him while explaining the potential harms, and try to persuade him through those he trusts. If he insists, then stand by him and support him, for he is most in need of advice and reminders.