The Catholic Church was present in Japan when it was bombed in 1945.  Japan's most Catholic city was Nagasaki, and at ground zero was the Catholic Cathedral of Nagasaki when it was bombed on 8/09/1945.  The article below says"
"Scarcely a fifth of a mile from Ground Zero, the Urakami Cathedral, its lovingly-crafted stained glass, and the worshippers inside were smashed into dust and goo and flash-broiled.  Heavy carved statues of Jesus and Mary were scorched black in an instant."

http://www.sspx-schism.com/JapaneseCatholics.htm#The%20last%20great%20persecution%20(1945)

The bombing of Hiroshima took place on 8/06/1945 on The Feast of the Transfiguration according to this article at http://www.dfms.org/6087_7516_ENG_HTM.htm and "the Japan surrendered on August 15, it was the Feast of Assumption, commemorating the ascension into heaven of Mary the Virgin, the Mother of Our Lord Jesus Christ."  (Of course, no where it the Bible does it say that Mary, the mother of the Lord Jesus Christ was bodily taken to heaven, and this is an assumption on the part of the Catholic Church that both her body was taken to heaven although her soul would be in heaven. This belief came into the Catholic church during the 4th century so why didn't they believe this during the 1st, 2nd and 3rd centuries.)