The Pope protected his 'flock' during the nightmare that was Hitler's reign. He also protected and saved many Jews from certain death and Catholic priests gave their lives to protect the many. Its simply untrue to paint Hitler as Christian.  He wasn't anymore Christian than Saddam Hussein or Joseph Stalin.
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  Hitler detested Christianity and considered it a weak man's crutch. Hitler may have been baptized as a baby, it didn't make him Christian.  Becoming a Christian involves much more than infant baptism.
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 Look up "Catholic resistance to Nazism"  thru Wikipedia and prepare to have your eyes opened.  Many other Christian individuals helped the Jews s well, remember Schindler's list?  it was based on a true story.  Oskar Schindler was Catholic as well. 
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 Of course it was America, a nation founded on Christian principals that was primarily instrumental in destroying an evil German death/war machine