Many things....there is justifiable concern on the part of some Christians that certain Jews see fit to comment on a film which accurately reflects part of their bible. There is also concern that Mr. Gibson Sr. was deceived into revealing the truth about himself. Also, there are concerns that Mel Gibson is being tarred with the "anti-Semite" brush.
What does it mean a "practicing Jew"? What do "practicing Jew" believe the future to be?
This is sort of like the man who came to Rabbi Akiva and asked to be taught the entire Torah while standing on one foot, but....
A practicing Jew, IMHO, is one who accepts upon him/herself the obligations of the Torah. For us, the future is that the Messiah will come speedily in our days.