AmEn....

The movie talk about a German lieutenant who realized the suffering that his political party was doing to the Jewish people, so he decided to change that by warning the world, including the Pope who he thought would be able to do something about it but he was wrong and the Pope was fearful and also he agree with some of Hitler’s ideas, but fortunately a young Jesuit help the lieutenant to communicate the horror of Jewish families to the Pope in order to stop this massacre.

1) What’s the difference between being Jewish and Judaism?¿

Generally, the use of the word Jew is used to refer to three groups: those with ethnic Jews, those who practice Judaism and those who are identified as such by their cultural and historical identity

The term refers to the Jewish religion or belief, tradition and culture of the Jewish people. It is the oldest of the three monotheistic religions more widely (along with Christianity and Islam, also known as "religions of the book" or "Abrahamic," and less of them in number of followers. Disaggregated Judaism historically the other two

So Jew is the person who practices the Judaism.

http://es.wikipedia.org/wiki/Juda%C3%ADsmo

2) What was the Pope’s position during World War 2?¿

During World War II, he made many efforts for peace, but also has been accused of being criticized very much agree with the German policy.

In the movie you can see that the Pope supported Hitler for the way he governed Germany and that’s why he was against de lieutenant idea of the gas chambers

http://www.exordio.com/1939-1945/personajes/pioxii.html

3) What are the differences between among Christian and Catholic perspectives regarding Nazi Germany?

Catholicism is in fact Christianity of the early years ... when Christianity spread to more countries you call Catholicism (Catholic means universal), the new Christianity or siblings who are separated not agree on some of the Vatican.
The Germans believed that Jewish people were like the evils of society and that wrong idea is what generate the war.

I think that World War 2 is one of the biggest mistakes of the humans, because just for the way that Hitler thought and his followers millions died most of them innocent people whose only “problem” was to follow their religion. This war has left a scar in our history and in the lives of those who had to live it.