Karl Barth made a brave stance, when he refused to take the Hitler salute at the Barman conference. Barth said ‘that he would only acknowledge Jesus at the conference and never a man.
As we look back into history we can see that it was a long time before German Christians would speak out against the Jewish genocide. It was only when they came under threat from Adolf Hitler that they unified.
Today many Christians are against Israel and they continue to play the anti-Semitic ticket, denying biblical prophecy and many things that are in conflict with biblical teaching. Revelation 19:20.