The topic is The Final Solution.
I'm constantly surprised that as Christians we would bring this up. Looking into what we actually know doesn't support the idea that Darwin was racist or that Darwin caused the Final Solution. Looking into the evidence only makes Christianity look bad, because Hitler said again and again that he was Christian, he had "God is with us" put on the Nazi belt buckles, and so on.
Hitler certainly did have a good relationship with the Christian church he was raised in. As others have mentioned, the Nazis and the Pope collaborated a lot both in maintaining the holocaust and in hiding the top Nazi’s after the end of the war. In addition, we have the words of Hitler himself, from his famous book Mein Kampf (pg 70):
Thus I believe today that I am acting according to the will of the almighty Creator: when I defend myself against the Jew, I am fighting for the work of the Lord.
Or, even more explicitly, Hitler made it very clear he was a Christian in this speech:
"My feelings as a Christian points me to my Lord and Savior as a fighter. It points me to the man who once in loneliness, surrounded by a few followers, recognized these Jews for what they were and summoned men to fight against them and who, God's truth! was greatest not as a sufferer but as a fighter. In boundless love as a Christian and as a man I read through the passage which tells us how the Lord at last rose in His might and seized the scourge to drive out of the Temple the brood of vipers and adders. How terrific was His fight for the world against the Jewish poison. To-day, after two thousand years, with deepest emotion I recognize more profoundly than ever before the fact that it was for this that He had to shed His blood upon the Cross. As a Christian I have no duty to allow myself to be cheated, but I have the duty to be a fighter for truth and justice... And if there is anything which could demonstrate that we are acting rightly it is the distress that daily grows. For as a Christian I have also a duty to my own people.
-12 April 1922 speech, Adolf Hitler, Oxford University Press, 1942
I doubt anyone would disagree that he held German heritage in high esteem. It is probably no coincidence that the most famous German religious leader of history, Martin Luther, wrote a whole book urging the violent suppression of the Jews. You can probably find it online it’s called “on the jews and their lies”.
Hitler was also clear about being a creationist:
Hitler
outlawed Darwin's work http://www.library.arizona.edu/exhibits/burnedbooks/documents.htm#guidelines
He also wrote the following:
Where do we acquire the right to believe that man has not always been what he is now? The study of nature teaches us that, in the animal kingdom just as much as in the vegetable kingdom, variations have occurred. They've occurred within the species, but none of these variations has an importance comparable with that which separates man from the monkey — assuming that this transformation really took place (from the less reliable Table Talk)
and:
Whoever would dare to raise a profane hand against that highest image of God among His creatures would sin against the bountiful Creator of this marvel and would collaborate in the expulsion from Paradise. Mein Kampf, vol. 2, chapter I.
It was by the Will of God that men were made of a certain bodily shape, were given their natures and their faculties. Whoever destroys His work wages war against God's Creation and God's Will. Mein Kampf, vol 2, chapter X
“iron law of Nature–which compels the various species to keep within the definite limits of their own life-forms when propagating and multiplying their kind. ...Such mating [inter-breeding] contradicts the will of Nature towards the selective improvements of life in general. … The stronger must dominate and not mate with the weaker … This urge for the maintenance of the unmixed breed … prevails throughout the whole of the natural world … The fox remains always a fox, the goose remains a goose, and the tiger will retain the character of a tiger.”
Mein Kampf, Chapter XI (pg 223 in many versions)
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In Christ-
Papias