So it would be better if Angelo Roncalli had let all those Jewish people die in Auschwitz instead?  Is that what you want to argue?  And yes, if that is the Catholic Church's understanding of sin, then it is rigid and ridculous.  Of course it isn't sinful for people to lie and cheat the Nazis to save lives.   It is a GOOD thing that should be applauded; Roncalli certainly thought he was doing a good thing when he was forging those documents..  The fact that the neo-Thomism idea of sin that permeated the pre-Vatican II Church and that came into vogue again under JPII/ Benedict is the issue.