No, He is remember that for hundreds of years Jews have been killed by religious bigots who blamed the Jews for Killing Jesus. It's the historic excuse for killing and oppressing jews. The Rabbi is just asking Mel to be Aware of it when he makes the film.
Who Killed Jesus? John 10:17-18
Let's not start equating Christianity as a religion with antisemitism. It hardly explains the antisemitism of the Arab (Moslem) world, and it doesn't help cement the Jewish-Christian alliance in our current confrontation with the Islamo-fascists.
If you thought Mel Gibson was going to start another holocaust right there in the theater..