For Jews the Christian position is even more bizarre. Why did God wait for the Second Temple to be destroyed to send Jesus? Why not right before the First Temple was destroyed? Why did it take decades after the death of Jesus for the temple to be destroyed, and why did his disciples continue to make offerings there after his death (according to Acts)? Why did the prophets say that the messiah would bring about world peace and a universal knowledge of God, if the actual messiah would die without fulfilling any of that and leave the world waiting century after century for a "second coming?" What are those prophecies that Jesus fulfilled, and why do you think that any of them are about The Messiah? Why do you accept the writings of Paul, who never met Jesus and whose only claim to authority was his own assertion that he saw Jesus in a vision? What exactly is the trinity (note: do not commit heresy with your answer)?

You asked where the Jewish messiah is, but like the old joke goes, for Jews the problem is waiting and waiting for a messiah that has yet to come, but for Christians the problem is that the messiah came and the world did not change.

Obviously rabbinic answers are not going to be very satisfactory or convincing to you; if rabbinic teachings made sense to you then you would have converted to Judaism by now. That said, rabbinic teachings are not a secret, so here are some answers to your challenges:

The animal sacrifice system was, according to rabbinic teaching, sufficient but not necessary to atone for sin. Among other things Jews point out that during the Babylonian exile there was no temple in Jerusalem and no sacrifices being offered, but that God did send prophets to explain to the Jewish people how they can deal with sin while in exile and without sacrifices. Another point is that when the sacrificial laws are stated, non-animal sacrifices are explicitly described; poor people could, for example, offer just a handful of flour if they could afford nothing better.

Why did God let the temple be destroyed? For the same reason the First Temple was destroyed. The Jewish people were punished for their national sins. In the case of the Second Temple, part of the national sin was dividing into competing factions who would sometimes try to use the oppressive Romans as a means to undermine competing sects.

Why are there no more prophets? In fact the rabbis do not have a single answer, it remains unclear in rabbinic tradition. Is that a problem? There are plenty of unclear, unanswered questions for Christians too; why is Jesus taking so long to come back? That said, some rabbinic answers include: the Jewish people are being punished for national sins; the true end of prophecy was the destruction of the First Temple, with subsequent prophets only repeating earlier prophecies; the prophets were sent at a time when the temptation to turn to idolatry was particularly strong, but that temptation diminished when the Jews returned to Israel and began building the Second Temple.

Maybe none of that works for you, and that's fine -- Jews are not actively seeking converts, so the opinion of non-Jews does not really matter; the Jewish view is that Judaism is for Jews and that the rest of the world only needs to hold to a handful of common sense morals (like not murdering each other and settling disputes in peaceful courts; I assume that much makes sense to you).