Is it permissible to marry a non-devout Christian woman who converted to Islam and repented from fornication after having been hesitant about Islam, but who is now convinced that Christ was not crucified, without the presence of her guardian due to the great distance and the difference in religion?

It is forbidden for this girl to live with you in your house, and repentance to Allah is obligatory. If the girl is from the People of the Book and has repented from adultery and improved her conduct, then your marriage to her is permissible. However, marriage to a woman from the People of the Book is not preferred, and it is better to seek a Muslim woman. If you insist on marrying her, it must be with the permission of her guardian, for "there is no marriage except with a guardian." If her guardian is unable to attend, he can appoint someone to marry off his daughter. A marriage contract in the mosque is not obligatory.