An Open Challenge to William Lane Craig

Dr. Craig answers one question a week here. I had asked him a question about Lessing's ugly broad ditch, which he answered nearly three years ago here. Immediately afterward I asked him a follow-up question. So far there has been no response. Maybe he'll get to it? At least I hope so. I issue a public challenge for him to answer it:
Dr. Craig, thanks for being willing to interact with us like you do here. It's a rare opportunity for which I am grateful.

You answered the "deeper problem" lurking behind my previous question about Lessing's "Ugly Broad Ditch" by arguing the inner witness of the Holy Spirit helps you leap that ditch. So here's a follow up, and I'll try to keep it short.

My question is this one: Would you please specify the propositional content of the inner witness of the Holy Spirit? Plantinga calls the content "the great things of the gospel", and includes the idea that "God exists", "God has forgiven and accepted me", or "God is the author of the Bible." You claim this content assures Christians that they are children of God. But such a notion echoes the poet whom Paul quoted who said, "we are his offspring." (Acts 17:28) You are surely arguing that the inner witness of the third person of the trinity contains more propositional content than that. Shouldn't this witness be more specific about what is meant to be a "child" of the kind of "God" one believes in, how one becomes a child of this God, where one can learn additional information about this God, what he must think of the authority of that source of information, and how he can best interpret it? For instance, to say "God exists" does not say anything about the attributes of this God, and might even be consistent with panentheism. To say "God is the author of the Bible" doesn't say what a believer should think about the specific nature of the Bible, or how to best interpret it.

Sincerely,
John W. Loftus
[This post was first published on October 19th, 2007. I will continue to post this every once in a while until Bill responds].