Mut’ah or temporary marriage refers to when a man marries a woman for a specific length of time in return for a particular amount of money. Mut’ah marriage was permitted at the beginning of Islam, then it was abrogated and became haram until the Day of Judgement.

It is not permissible for a Muslim man to marry a Hindu woman and it is not permissible for you to help your friend to marry this Hindu girl.

If a person converts to Islam, even with the intention of marriage, he will look at the perfection of Islam and be encouraged to form a sincere intention, so he will become sincere towards Allah and become a good Muslim, and Allah will accept his Islam.