It is even more ironic that they are up in the air about Mel's father denying the Holocaust when they are trying to deny that some, not all, Jews played a part in the Crucifixion.
I don't see the connection.
More to the point, Jewish (and by extension, Christian) theology teaches that G-D will visit the sins of the father upon the off-spring...I'm not exactly sure of the quotation but I believe it is to the "third generation". The meaning of the verse, of course, is not to punish children for the sins of the father, but to portray how a father's evil influence will affect his children and grandchildren.
Please note that I am (so far) speaking generally, not specifically about the elder Gibson or his son.
It is even more ironic that they are up in the air about Mel's father denying the Holocaust when they are trying to deny that some, not all, Jews played a part in the Crucifixion.
I didn't see that denial. What I saw was that they were saying the movie "blames the Jews" for the crucifixion (sp?).
Be that as it may, are you under the mistaken impression that Jews believe in any part of the so-called, "New Testament"?