You could do little else that would be more effective in discrediting Christianity as to try to set this guy is our poster boy.
He is a antisemitic conspiracy mongering Holocaust denying loon.
That is simply the truth.
He being an antisemitic conspiracy mongering Holocaust denying loon is serving the “larger agenda” of Hollywood more than it is doing anything conceivable to hinder it.
It isn’t a matter of circling the wagons around him, it is a matter of telling anti-Christian, racist bigots, (to use your language, since Christians aren’t Jews) that after all these years they can become a little less obsessed with destroying the man, at least a conservatives can.
Hollywood doesn’t bother you, a generations old war against Christianity by Hollywood doesn’t bother you, Gibson losing his career, doesn’t bother you, only his drunken insult against Jews bothers you, that is an unusual case of tunnel vision and selective outrage, and bigotry for a supposed conservative.