What Is The Forbidden In Islam To Marry To Nonbelievers?

It is not forbidden to marry non Muslims. It is forbidden for women to marry non-muslims and men can marry non muslim women. It is genarlly considered that if a woman marries a non muslim then she would have to follow her husbands religion so she becomes a non muslim, so on the other hand a male muslim marries a non muslim female he will accordingly convert her to a muslim and he would have a complete muslim family

It's the usual deal - a Muslim man may marry whom he chooses, a Muslim woman may not marry a non-Muslim.