What is faith? As I read through much of what's said in this thread, I find that one of the problems, if not much of the problem has to do with how knowledge is acquired (an obvious observation). I have also been a student of Wittgenstein as some of you know, and I have great respect for Wittgenstein's ideas. In fact, his last work (On Certainty) tells us much about what it means to have knowledge, and if anything, it tells how expansive the use of the word know is. I have very rarely ever disagreed with Wittgenstein, because much of what I wrote on Wittgenstein was an exegesis. Although I did develop my own theory of epistemology based on his ideas.
My disagreement with Wittgenstein is that even he didn't fully appreciate the impact of his work, i.e., Wittgenstein's ideas, I believe, go much further than he even he thought. Although he did not downplay the importance of the mystical, he did not believe that we could have knowledge of the mystical, and this also carried over into his ethical discussions. He limits language, in terms of what we can know, to the world, and this is where I believe Wittgenstein went astray. The mystical is displayed by a showing, not a knowing according to Wittgenstein. This idea remains a part of his thinking from his early philosophy to his later philosophy. His later philosophy is much more accurate and practical than his earlier philosophy, but it still limits our knowing to how we use these words within the world, and within the culture developed around these words. The reasons for this have to do with the Austrian culture he came out of, and also the philosophical culture that molded some of his thinking.
My own view is that our knowledge is quite more expansive than Wittgenstein realized, and it's much more expansive than many materialists acknowledge. I definitely do not think that science has the corner on what it means to have knowledge. Some of you put a much higher premium on scientific thinking, and there are good reasons for this, but I think it is a mistaken notion that limits what we can know. One example comes to mind, and that is the experience of the self, my knowledge of myself, which surely is stronger in many ways than any scientific knowledge (any experimentation). In fact, our self awareness in some ways is bedrock to all that follows, including science.