I believe the Jews were given, 3326 years and five days ago, 2 sapphire, square (not like the rounded and oft-depicted ones Charlton Heston brought down) tablets upon which were written the 10 commandments for Jews (ahem, in Hebrew,) and then 40 days, one highly misunderstood golden calf incident (and broken aforementioned tablets,) and another 80 days later... a complete written and oral Torah via Moses our prophet...and a brand new set of sapphire tablets to boot, this time carved by Moses and engraved by G-d Himself.
The Books of Moses absolutely cannot be understood by themselves. Here is a link to some collated proofs of this fact, but in broad brush, there are many life-death (sentence) situations where G-d commands us to do or not to do something and then doesn’t explain it. (ie, “work” on the Sabbath.) Wouldn’t our benevolent Creator bother to tell us what He is talking about— with great, exacting detail? Can I light a fire on the Sabbath? No, it says so explicitly. Great. Can I move a sofa in my living room? It’s life or death— I better have a ready-answer...
http://www.aishdas.org/student/oral.htm
What would have been the reaction, not only among the Chassidim, but among Jews throughout the four corners of the earth, had God miraculously raised the Rebbe from the dead ? ?Excepting he himself said otherwise, He would have been proclaimed Moshiach.
Now I know you do not believe Yeshua is the Moshiach. There is no way on earth you could ever believe that unless God revealed it to you. All the proof texts in the Tanach will not convince you since you see them otherwise. Only God could convince you otherwise. Isaiah 52/53 is something you see as Israel the suffering servant. In the First Century many Jews believed Yeshua was Moshiach. Because of their eyewitness accounts, handed down both orally and in writings, many more Gentiles came to believe the same core starting point. It all comes down to some eyewitness account. You could not believe that HaShem gave the Torah through Moshe unless HaShem gave you that faith; you would fade away like the majority of Jews; they don't believe it. They may practice a form of Judaism, or may not at all, but it is not Torah. Homosexual marriage, in reform, conservative, or whatever shuls ? You know that is not Torah. It is your job, your mission to reach those Jewish souls and turn them back to Torah. Christians really can't affect that unless God chooses some Jew to reveal himself. I know you don't believe it, yet look how few Jews really become Christian/Messianic and last. Many return to Judaism because the myriad of Christian denominations, sects, and cults is so confusing and irrational.
I respect the Chabadikim. They lay down their lives for Jews. They love the LORD as they understand him. No, they are not perfect, none of us are, yet they seem to me to be the best of traditional Judaism. If God wanted a quarter million missionaries in this world in a miraculous fashion, he could use the Chabadikim as his Jewels. Now that would be some miracle nobody saw coming; probably just my fantasy but with God nothing is impossible.