Rabbi Michael Lerner has an excellent essay in Tikkun urging Christians to respond to Mel Gibson’s The Passion of the Christ with what he calls the Gospel of Love. Lerner takes the view that the issues raised by the film are much broader than just anti-Semitism.
So let's understand that the attempt to revive Christian enthusiasm around the part of the story that is focused on cruelty and pain is not only (or even primarily) a threat to the Jews, but rather a threat to all those decent, loving, and generous Christians who have found in the Jesus story a foundation for their most humane and caring instincts. It is these Christians who are under assault by Mel Gibson's movie, and by the particular form of Christian evangelicalism that it is meant to stimulate. Yet, in a deeper way, the Gibson movie is likely to stimulate a broader assault on all of us who seek to build a world based on caring and love, cooperation and generosity, by giving strength to the part within each of us that despairs, the voice within each of us that tells us that cruelty is what is "really how the other is, really how the world is," the voice inside each of us that feels that there is no point in struggling to transform the world because it is too hopeless and too dominated by craziness (and that is the point of the Jews in the Gospel calling for Jesus to be killed, because it is saying "even the Jews, his own people" do this, because evil is dominant in the world and always will be, and the only way out is to believe in Jesus and find salvation in another world, and despair of changing this one). So, part of the struggle is to reclaim and reaffirm the Jewish Jesus, the Jesus who retains hope for building love right here, the Jesus who unabashedly proclaims that the Kingdom of Heaven has arrived (which is to say, that it is here on earth, that the world right now can be based on love and kindness, and that we don't have to wait for some future time or "the end of days" as described by Isaiah, because it is here now, we can make it happen right away by the way that we live our lives). And it is this voice of Jesus that The Passion movie seeks to marginalize or make invisible.
This is another article worth the read.