So many messages to reply to... I'll try and keep it short for each of them. Thanks to everyone for writing!
Qatada, I still owe you a close reading of all your posts from the start, and I look forward to replying to them with more depth.
WRITER, I'm also going to need to look into the thoughts you had about the Jews in Medina. What are the historical sources or texts for what you said? Please forgive me for answering the other posts in the meantime, because I don't need to sit and read as much for those conversations as for these two.
YusufNoor, regarding the passage you posted, I do believe it's true that the Israelites were often stubborn and disobedient. It's important to realise, though, that the prophets were part of a righteous group who preserved the Jewish understanding of God and of His Law throughout history, so that people like Nehemiah could know what it was and so that his generation could turn to it wholeheartedly. God gave some really beautiful blessings to the generation who were rebuilding the Temple around that time, especially in the book of Haggai. Zechariah is the same, though its message is more complex (it's a long book), and the description of how God made one nation holy so that the whole world could come to know Him in close relationship is really amazing in that book. I don't know what else you were trying to point out from that passage, but let me know where you want to go from those thoughts of how I read it. God deserves our wholehearted obedience, so He always wanted the majority of Israel to turn back to the commandments. With that I definitely agree. I don't believe that the testimony of who He is ever left them, though.
The one thing I really wanted to ask in my first post was how a Jew in the Middle Ages could accept Muhammad on the basis of the Jewish commandments, if they were actually no longer in possession of those commandments in an accurate form. Does that make sense?
Perseveranze, I think you make a really important point about checking each claim on the basis of its own evidence. I didn't say that the Qur'an was changed, though. I just suggested for the purpose of analogy (and I hope it wasn't disrespectful) that if someone claimed that Muhammad himself had added to the visions- that the first things he taught were partly from God, and partly from himself- you wouldn't accept that claim without lots of reasons to do so. But this is how the Jews would have felt when they were told that the Judiams they followed was kind of true but actually corrupted. That doesn't mean it couldn't have been corrupted, but if it was... then the Jews had no way left of testing Muhammad according to the actual Torah. So why ask them to do so? I don't understand it, and I know you must have some well thought-through perspectives about it, that's why I ask.
Abz2000, it's hard for me to reply to you unless I know how much of the Jewish scriptures you think are accurate. You quoted Deuteronomy and Isaiah as proofs, but do you actually believe those books are from God and uncorrupted? Otherwise it's hard to know how to answer your thoughts.
Insaanah, I really liked your post, I've never thought of it that way before. As someone who has always believed in a God who did not make Himself incarnate as a man, it might be hard to comprehend what it means for a Christian to believe in Jesus. But I was taught that he wasn't just a man. The affection I had for 'Jesus' was not actually affection for a historical person in his own right, but actually a love for God, flawed as my understanding of Him was. So I actually have never had a relationship with the person Jesus, it all belonged to God. If I met Jesus I would have love for him as for any other human, and if he really was a righteous and God-fearing person then I would respect him, but it would have no relationship to the worship that belongs only to God and that I once thought belonged to Jesus as well. It doesn't. It's not his and I never intended it towards a created being. That's why I don't see it as natural or right to meet in the middle, so to speak

For me, my belief in any of the prophets actually comes from the testimony of the Jewish tradition about them, and they don't accept Jesus as a prophet. If I accepted Islam as the community in which God has made His revelation clear and preserved it, then of course I would see Jesus as a prophet. But I can't see how a Jew could guard the Torah (as they currently have it) and still accept either Christianity or Islam, so I don't know how either of those religions could be true. One of my Christian friends keeps telling me things about Jesus' miracles and nobility that are very similar to what people here are telling me about Muhammad, but those things aren't the way in which the Jews were supposed to test a claim of revelation... as far as I know. So I do believe that Christianity and Islam have a lot of kernels of truth in them, and that people in those faiths have a real experience with God, but I'm listening to Judaism for their understanding of what it means that we should submit to our creator and know Him as He reveals His blessing to us. What do you think?