Yes, I am ashamed also of a lot of garbage in the history of the Roman Catholic Church. I just read to review the new book, Holy Warriors: A Modern History of the Crusades, by Jonathan Phillips (Random House); a series of Medieval popes are responsible for a lot of slaughter. And I have never been satisfied with the Church's response to the holocaust.
When told that the Pope had spoken against the persecution of Jews in encyclicals which were not understood, Albert Camus (an absurd Frenchman - an Anarchist with Communist sympathies ) replied. In 1948 he addressed an abbey of Dominican monks who asked him to speak on what unbelievers expect from Christians: "What the world expects of Christians is that they should speak out, loud and clear, and that they should express their condemnation in such a way that never a doubt, never the slightest doubt, could rise in the heart of the simplest man."
Link (here) to Fr. Raymond Schroth, S.J. his article is entitled, How to Love Israel.