Pope Pius XII spoke out
unequivocally against Naziism before and during the War in literally scores of newspaper articles and radio announcements. He melted Vatican gold to pay for the expenses of providing travelling papers and for hiding Jews and secreting them to safe countries.
He hid 4000 Jews in his own houses. He was responsible for saving 850 000 Jewish lives. So brave was he that the Chief Rabbi of Rome converted to Catholicism after the war, Golda Meir sang his praises, and he was named one of the Righteous Ones by Israel.
Now, if your friend wants to know where Hitler got his Final Solution from concerning the disposal of the Jews, look at Luther’s anti-Jewish program. Hitler burned the synagogues on Luther’s birthday and admits to being inspired by Luther’s book
The Jews and Their Lies.
Perhaps your friend may enjoy pondering the notion that folks who live in glass houses should not cast stones?