Why do Christians deny that Hitler was a Christian despite all the proof..?

Today I have seen a doentary on Live India TV channel a short doentary about Hitler.In that doentary it is shown that wanted to be a father of church but his father dislike it. Secondly was interested in painting, he approached the painting and art school but the Jewish teacher had rejected him. Lastly the mother of Hitler was suffer ring from cancer and she was under the treatment of Jewish doctor. Held jewish doctor responsible for the death of his mother therefore he became against Jews and killed 60 lackhs jews mercilessly. But he was christian.