The Ruling on the Marriage of a Muslim Woman to a Christian Man

Question :

What is the ruling on the marriage of a Muslim woman to a Christian man? And what is the ruling of the Islamic Law on the children of such a marriage? And what is the ruling on the registrar who performs such a marriage? And what is the ruling on the wife, if she knew that such a marriage was invalid? And should the legal punishment be carried out upon her, or not? And if the husband embraces. Islam, what is the ruling on the first marriage and how should the new marriage be completed?

Answer:

It is forbidden for a Muslim woman to marry a Christian man or any other disbeliever, according to the Words of Allah, Most High:
"And give not (your daughters) in marriage to Al-Mushrikün till they believe (in Allah Alone)."

and His Words : "They are not lawful (wives) for the disbelievers nor are the disbelievers lawful (husbands) for them."

And when he makes a contract of marriage with her, it must be annulled immediately, and if the wife knew this and knew the ruling, she deserves to be chastised as does the guardian, the witnesses and the registrar, if they knew that. And if she bears children, they follow their mother in Islam. And if the husband embraces Islam, the contract of marriage should be renewed, after the truth of his acceptance of Islam has been confirmed, so that it should not be a device (in order to make the marriage legal). And if he apostatizes after that, his head should be chopped off, according to the Hadith:
"Whoever changes his religion, kill him."

Source:
Ibn Jibreen
Fatawa Islamiyah, Vol. 5 Pages 399-400