Question, if you get a subpoena for some document for a civil case, can’t you challenge it? Or do you just hand over everything because you don’t want to act guilty? If that is your argument, God help you.
Sure, a party can object to discovery items on such issues as relevancy, vagueness, or that it concerns privileged information. The court will then rule. In this case, though, since the alleged molester is dead, claims of privilege will be more problematic. It will certainly give the appearance of the Church hiding some wrongdoing of its own, rather than protecting the reputation of a dead man, etc.