That sounds like you are saying that witness evidence is useless even when it is confirmed by others.
What I said is that words in a book are not evidence of anything except that somebody wrote them down. The words may report the truth, but one can't know that just from the words alone. He has to confirm them empirically. Thus, the Bible say that there was a man named Moses and a king named David. Neither of those is true because words in a book said so. But in the case of David, we have empirical evidence that such a king once ruled in the region the words say he did. Now, we know David was real, but Moses, lacking empiric confirmation, may be a fictional character or a composite or part historical and part legend - we just can't say if all we have are words in a book.
Regarding the Bible, consider the Qur'an. Open it and read it. Do you believe it's all factual? Probably not. Some of it might be true. All of it might be true. We don't have any way to determine which if any parts are knowledge, that is, words that accurately describe some part of reality, unless we look elsewhere. Until we do that, all we can say is that these are the words that the authors of the Qur'an chose to write down, some or all may be true, or none at all. Even if we find contradictory scriptures ensuring that at least one is incorrect, we can't tell which one without looking at the world.
The skeptic takes that same attitude to the Bible. He's not going to believe something just because it is written in that book any more than you believe that something you read in the Qur'an is true because it appears there.
So empiricism is the only thing worth believing and witness evidence is nothing.
Empiricism, or experience, is the only path to knowledge, knowledge being the collection of ideas that accurately map some aspect of reality. That can only be determined empirically. So, yes, only that which has been discovered empirically is worth believing.
A problem I would have with extreme empiricism is the dismissing of evidence for the supernatural which is based on the experiences of others.
I don't count those reports as being what they are claimed to be - experience of the supernatural. I don't know it's not, just that words alone aren't enough to decide. So when you say dismiss, please understand that not believing is not the same as saying that the comment is wrong, just that there is insufficient evidence to decide the matter.
It is a big call in this little life of ours to ignore theology because we have chosen one only source of knowledge.
I don't consider theology knowledge, by which I mean the study of things that believers believe, things that presume the existence of God and the validity of a holy book. If we're talking about the Bible as history or literature or as a cultural influence, I'm not including that in theology. Those are topics an unbeliever can profit from studying. Theology as I've defined it is all metaphysical speculation that can not be confirmed or disconfirmed. This is not knowledge as I've defined that word.
I'd add here that it is often thought that what words like mine mean are that no experience is valuable except through the senses, empirical, and that only rational thought has value. That is not my position. I am referring to the process of deciding what is true about the world, not how that information is used. There are other kinds of mental processes of value, such as experiencing good music or a good meal. Empiricism is how we discover which songs and which recipes bring us pleasure and which don't. When it's time to enjoy them, we put our empiricist hat aside and simply enjoy life. THAT is the goal of reason, not merely knowing. We use that knowledge to manage our other experiences such as feelings and urges to maximize the kinds of experiences we enjoy and minimizing those we don't. Knowledge is information for living, but living a satisfying life is the goal, and the value of the knowledge is limited to how well it lets us do that.
Theology doesn't do anything for me. It doesn't make me happier or wiser or able to make better decisions. If such ideas did that, as it seems to do for many struggling to stay sober or out of prison, which is part of managing experience to facilitate a happy life, then they would have value, but they still wouldn't constitute knowledge.