Ok, this one should be familiar. Mel Gibson is the well-known producer of “The Passion of the Christ”, the famous Guinea Pig ripoff that presented itself as a true story. Originally Australian, Gibson once starred such epic movies as Mad Max. These days he is an anti-Semite and all-around racist, homophobe, abusive boyfriend, misogynist (here; here), and founder of his own little bizarre Catholic sect (with his father, the clinically insane holocaust denier Hutton Gibson).
As for the anti-semitism, the main incident (apart from the repulsive Passion movie and comments in that respect) occurred when Gibson was arrested for DUI while speeding in his vehicle with an open container of alcohol in 2006. He remarked to the arresting officer James Mee, who is Jewish, saying "Fucking Jews...the Jews are responsible for all the wars in the world." More here.
As Scottish comedian Frankie Boyle said of Gibson: "When they were making Braveheart, everyone said, 'Oh it's ridiculous, Mel Gibson playing a Scottish guy, that's not gonna be very convincing.' And look at him now: an alcoholic racist."
He has threatened to cut funding to his church if its members don't stop talking about his decision to leave his wife for his mistress (see here).
He is also a creationist, mostly because of the rock-solid “if humans descended from monkeys then why are there still monkeys” argument.
According to rumor, at least, he is rather left-oriented when it comes to politics (apart from issues related to the rights of minorities, obviously). It is important to remember that, despite a statistical correlation, Godbotting bigotry or even theocracy doesn’t immediately imply being a Republican.
Diagnosis: Deranged, unhinged, malevolent moron and nefarious nutjob. Despite attracting some 70 people to his sect, he probably wields relatively minor influence.