All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
It is permitted to marry a chaste Christian woman.
Allah Says (what means): {(Lawful to you in marriage) are chaste women from the believers and chaste women from those who were given the Scripture (Jews and Christians).} [Quran 5: 5]
In the above-stated verse, “chaste women” means modest and virtuous. But it is disliked for a Muslim to marry a Christian or Jewish woman as long as there are free Muslim women.
Shaykh Ibn Taymiyyah said in his book Al-Fataawa Al-Kubra: “It is disliked to marry free Christian or Jewish women as long as there are free Muslim women. This is the opinion of Qadi Abu Ya'la (a Hanbali scholar) and most scholars.”
Thus, we advise our brother the inquirer to obey his parents and family; i.e., to marry a free Muslim woman so that he might feel safe concerning his children's religion (to be Muslims). However, if this woman embraces Islam, we advise you to keep her as your wife as well as to show great kindness towards your parents so that you can convince them in such a situation, and you are not obliged to obey them to divorce her.
Allah knows best.