In this video, this author seems to say that no amount of scientific, factual evidence can turn someone into a believer or reveal God in any way (at least that’s how it seems in the video, I haven’t read the book).
There’s two types of knowledge: “what” knowledge, which is of facts and evidence, and “why” knowledge, which is revealed to us. He doesn’t seem to consider the “what” knowledge important for knowing Christianity to be true, but I think he’s wrong.
It seems that the “why” questions and knowledge he talks about cannot be separated from the “what”. If the “what” of God’s existence or Jesus’s life, death, and resurrection are not true, then the “why” questions do not matter. So knowing the facts of the matter is important for knowing whether the “why” answers are valid or not.