Where were the religious leaders during World War 2?

If your question was really "Why did the clergy not oppose WW II", many did, especially in Germany, where many of them were unlucky enough to get sent to the camps.

Answer

I read this story about a man who was in the German Air Force during World War II but who later became one of Jehovah's Witnesses, he recalled:

What disturbed me during those war years ... was seeing clergymen of practically all denominations Catholic, Lutheran, Episcopal, and so forth blessing the aircraft and their crews before they took off on missions to drop their deadly cargo. I often thought, Whose side is God on?�

German soldiers wore a belt with a buckle on which was inscribed the words Gott mit uns (God is with us). But I wondered, Why wouldn't God be with soldiers on the other side who were of the same religion and who were praying to the same God?

so it appears many religious leaders had center stage during those years.

Answer

During WW1, WW2, Korea, Vietnam, and the Gulf War the clergy were right there in the battles with the men. On board naval vessels, obviously, they could not be in the planes so they gave the crews their blessings before the flights. Some of the crews would ask the clergy to bless their aircraft for them which the clergy would gladly do.

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