The Ruling on Announcing Marriage in a Church
Question :
Is it permissible for the believer to announce his marriage to a Christian woman in a church and at the hands of a priest, after marrying her in accordance with the Sunnah of Allah and His Messenger in an English marriage office?
Answer:
It is not permissible for the believer to announce his marriage to a Muslim woman or a Christian woman in the church, nor at the hands of a priest, even if it is after marrying her in accordance with the Sunnah of Allah and His Messenger.. This is because of the imitation of the Christians included in their marriage ceremonies, the glorification of their rituals, their places of worship, showing reverence to their scholars and their worshippers, and honoring them, according to the words of the Prophet :
"Whoever imitates a people, he is one of them."
Narrated by Imam Ahmad with a hasan chain of narrators.
Source:
The Permanent Committee
Fatawa Islamiyah, Vol. 5 Page 297