Be careful about learning about the Bible from movies. The Gospel of John is in no way anti-Semitic. John was an observant and faithful Jew, as was Christ. All of the early Christians were Jews. All of the apostles were Jews, including Paul. In fact, Paul was the greatest student of Rabbi Gamaliel, considered one of the greatest rabbis of all time. Most Christians are not anti-Semitic and realize that salvation is from the Jews. Most Christians don't call themselves "holy and spotless", although we are called to strive for that. Actually, I don't know a single Christian who would have the arrogance to make that claim about himself or herself, and I know a lot of Christians. That's not to say that there aren't hypocritical people who are also Christians. Hypocrisy is everywhere. The Bible warns people - believers - to beware of this fault, so Jesus anticipated that we would fall in that way (and in many other ways). So we pray daily to become more holy and more faithful and more loving to our brothers and sisters on this earth.
As for the atrocities committed by Hitler and those like him, remember that Hitler tried to outlaw all religions. And he killed Jews and Catholics. 60,000 Catholics, mostly priests and nuns who spoke out against him, were killed in the concentration camps along with the Jews. Hitler was not a Christian, but an atheist. That also describes the other mass murderers of the 20th century (Stalin, Mao, Mussolini).
As for who is responsible for the killing of Christ, we all are. It was pre-ordained that He would die in that way. The leading Jews of the time, who were corrupt, instigated the crucifixion. The mobs were controlled by the leaders. The Romans went along to avoid a riot. And all sinners throughout the ages bear the guilt because of our sins, which is why Jesus died on the cross.
The factions that exist between religious groups, especially between Christians, are unfortunate. Through some people's zeal, they separate themselves from brothers and sisters in Christ. The Apostle Paul did this before he became a Christian (see Acts of the Apostles). I pray that people will open their hearts to God and move away from divisions. That isn't to say that we should accept things that are sinful, but that we should speak with love towards others, and with a focus on bringing people together in Christ.
One last comment. You called the Jews "another Christian faction". Jews are not Christians, as a Christian is one who believes in Christ as the Messiah. Jews do not believe that Jesus was the Messiah. They continue to wait for their Messiah.
