How did you come to become a Rabbi? Are you a regular Jew or Messianic Jew? (hope that does not offend you)
Unlike most who choose to enroll in rabbinical school, I did not initially have any professional aspirations. My father was a congregational rabbi for most of his career and I saw enough first hand to affirm the joke that, "the rabbinate is not the place for a nice Jewish boy."
My reasons were more personal. Most of what one learns in rabbinical school (or at least mine, anyway) are applicable to every Jew such as keeping Shabbat or Kosher. Rabbinical school obviously covers these subjects in much greater detail than most Jewish education (hopefully), and my goal was to know these subjects well enough that if I would ever be faced with a question, I would have the tools to figure out an answer. To borrow the idiom from one of our teachings, this would be "learning with the intention of doing" (M. Avot 4:5).
I am not a Messianic Jew, but I should add I would not take offense at being asked the question!
You would be surprised how many Jews have become offended and angry by my asking that question. I ask that question first because I have another question I want to ask but it doesn't apply to Messianic Jews. So, I hope that I may ask you.
I know that during Jesus' day, those who ran the Temple did not accept and plotted to have Him killed. What I want to know is why it is that most Jewish people today still choose not to accept Jesus as the Messiah. Perhaps, you can enlighten me. I am just curious.
There's another rabbinic teaching that "the impatient cannot teach" (M. Avot 2:5). When questions are asked with respect and sincerity, I do my best to answer similarly.
As to your question of why Jews reject Jesus as the Messiah, that requires a far more detailed answer than I can offer here responsibly, but there is much written (with different opinions) available.
Where would I find the answer? Trying to understand the reasoning.