Aside from protecting some people in the area near him in Italy, what we can fairly state is that he sure didn’t rise to the occasion in a proper Christian fashion.
“Dear children, let us not love with words or speech but with actions and in truth.” 1 John 3:18
“Not many of you should become teachers, my brothers, for you know that we who teach will be judged with greater strictness.: James 3:1
There WERE some Christian clerics (including some Roman Catholic priests) who did speak up and visibly seek to save lives. A good quick example will suffice:
https://www.christianitytoday.com/history/people/martyrs/dietrich-bonhoeffer.html
abundant evidence shows that church efforts throughout Europe to hide Jews or provide them with papers to enable their escape enjoyed the explicit support of Pius.