BERLIN (Reuters) - Germany's Roman Catholic and Protestant churches joined the Jewish community Thursday in a rare joint declaration to warn that Mel Gibson's film "The Passion of the Christ" could fan anti-Semitism in Europe. In their first joint statement in four years, the Central Council of Jews in Germany, the German Bishops Conference and the Protestant Church criticized the film that opened on Thursday in Germany for its "overly negative portrayal" of Jews. "There is a danger the film will revive anti-Semitic prejudices," they said.