“The Jewish religion is not about the messiah. It is about Torah—period.”
If this be so, why do Jews not follow Torah?
As Mama says, "You tell me, and we'll both know."
Unless of course you aren't referring to liberal Jews but to Orthodox Jews and you're saying they don't follow Torah because they don't offer sacrifices in Jerusalem (which they can't until all the criteria are met; to do so in the absence of those criteria would be to violate Torah, not follow it. And this is the real Messiah's job: to put things back so all Torah may once again be observed (ie, rebuild the Temple, etc.).
And unless you're implying that since the sacrifices cannot be carried out at this time that the Torah as "expired" (G-d forbid!). First, the Torah itself predicts exile (during which sacrifices cannot be brought)--never as a punishment for "rejecting the messiah," but always and only for straying from the Torah itself. And second, if the destruction of the Temple and the cessation of the offerings signaled the arrival of Mashiach, then he came in Jeremiah's time, because the Temple was destroyed then long before the Second Temple was destroyed by the Romans (seventy years with no sacrifices).