Here in the U.K.

Answer

It is kufr to go to a church, especially for interfaith dialogue. Interfaith dialogue is haraam. We are permitted to only present the teachings of Islam without listening to the propagation of other religions, cults and ideologies. But this presentation may not be made in a temple of kufr and shirk.

Participating in the service aggravates the kufr. In other words, they have lost their Imaan. It is imperative for the participants to repent, renew their Imaan and their Nikah if they are married persons.

It is not permissible to enter a church and to sit or stand with 'respect' to listen to the kufr prayers/ services, even for the sake of 'good relationship'. It is extremely unintelligent to become a murtad for the sake of 'good relationship' with kuffaar. This idea is a deception of shaitaan. Those who are interested in interfaith literature, may write to The Majlis. The Interfaith movement spearheaded by the Saudi king at the behest of his master, the U.S.A. is a dangerous trap of kufr.