A Muslim lady in our community is entering into a marriage with a devout Christian man.

Answer

Every Muslim knows or should know that the marriage of a Muslim woman to any kaafir man is not valid. It will be an adulterous relationship.

2. If the lady believes that such a marriage is permissible in terms of Islam, will that be regarded as an act of Kufr?

A. The woman who believes that the zina relationship is permissible loses her Imaan. She becomes a murtaddah.

3. If the officiating Sheik performing the "Nikah" regards the marriage as permissible, what is the status of his Imaan in terms of the Shariah?

A. The officiating jaahil 'sheikh' is an agent of Iblees. He too loses his Imaan. He too becomes murtadd.

4. Are we as Muslims allowed to attend such a marriage?

A. Those who attend such a zina relationship presented in the guise of 'marriage' also lose their Imaan.

5. What type of relationship should we maintain with the married couple and the officiating Sheik, bearing in mind that maintaining family ties is an important Islamic value?

A. The couple will not be married. It is haraam to have any relationship with them. Sever all ties. Maintaining ties with a murtad family member is a grievous sin.