Is it permissible for a Christian to act as an agent on behalf of a Muslim in Sunni Sharia courts for Khul' (divorce by mutual consent) and divorce proceedings? What is the fate of transactions conducted in this manner, and does the divorce take effect if this is refused?

It is permissible to appoint a non-Muslim as an agent for khul' (divorce at the wife's instance) and talaq (definition) (repudiation by the husband). The general rule is that anyone whose action in khul' or talaq is valid for themselves, whether male or female, Muslim or non-Muslim, may be appointed as an agent. In such a case, the talaq and khul' are effected by the agent.