How can we argue with that? Christians tend to 'just know' things that they can't possibly know.
In my own case I am sometimes asked "how do you know that". My usual 'off pat' answer is "native wit". The truth lies somewhere between that humorous response and a degree in physics, a career in engineering and an enquiring mind which notices interesting things in the world around me.
However, the difference is that I only get that question when someone is surprised to find that I was right, and that is very different from the case of the theologians.
Nobody can tell whether theologians (or Christians) have access to some sort of special knowledge, but I think all of us can take a shrewd guess . . . using native wit!
Their claims are not falsifiable - and by some definitions they are therefore not science. That might not matter to everyone . . .
. . . but it matters to me.