Yet what point is there to the “final solution” if there are not clear blood lines that need to be improved? If we all were descended from Adam and Eve a few thousand years ago, then no blood lines can possibly exist.

 

The fact of the matter is that the holocaust is predicated on evolution as being a real thing. Remove evolution form the picture and you have no reason for genocide.

To blame the Holocaust on atheism or especially "Darwinism" (a meaningless term) is preposterous. Anyone with even the most basic understanding of the Third Reich will understand that it is something quite the opposite that makes the Nazi regime so terrifying. The Israeli historian Yehuda Bauer pointed out that:

The basic motivation [of the Holocaust] was purely ideological, rooted in an illusionary world of Nazi imagination, where an international Jewish conspiracy to control the world was opposed to a parallel Aryan quest. No genocide to date had been based so completely on myths, on hallucinations, on abstract, nonpragmatic ideology – which was then executed by very rational, pragmatic means

What may make the Third Reich remarkable is the astonishing degree to which the entire enterprise was built from a foundation of myth and delusion so astonishingly inane that, before 1933, most of Hitler's opponents dismissed him as a ranting idiot and a fringe lunatic. And who could blame them? But then, moving forward a few years, the Nazis had already codified their delusions in the form of law. In 1935, the Nazis passed the Nuremberg Law and the Reich Citizenship Law to deny Jews in Germany citizenship. At the same time, the Nazis passed the "Law for Protection of German Blood and Honor", which used a ridiculous pseudoscientific basis for distinguishing between a Juden, a Mischling and a Deutscher. 

What makes the Holocaust even more remarkable, apart from its total iniquity, is that it represents the most total pursuit of a path based on a total delusion. Stalin and Mao murdered many more people, but the Cultural Revolution and the gulag archipelago derived from the obsession with power that both dictators had. The Holocaust had no such pragmatic gains in it. It was costing money, depleting Germany of educated people, a drain on wartime resources. There was absolutely no reason for its pursuit other than the complete and utter delusion of the "world Jewish conspiracy" which the Nazi leadership obsessed itself with. 

If the horrors of Nazi Germany should teach us anything, it should teach us of the terrible dangers of a preposterous ideology that sacrifices the rationality of the individual for the emotions of the crowd (which was precisely how Hitler came to power), and which is seeped in a fantasy world of preposterous myth. The Nazis came to power on the Dolchstoßlegende, the famous "Stab-in-the-back" myth which was propagated extensively by the Nazis (and in many cases, believed by them as well), which the German people were only too happy to accept. The premise of the myth was that the German post-WWI woes were due to a stab in the back by the German leadership which surrendered to the Entente powers (hence resulting in the hated Treaty of Versailles) while German forces were "50 miles from Paris"*. Eventually, the various arms of Nazi mythology became intertwined, and Hitler became obsessed with the notion that the stab actually resulted from a Bolshevik-Jewish conspiracy to control the world. What makes the Nazis so frightening is not that they were "atheists" or "Darwinists" but the fact that their entire enterprise, their beauracracy, their worldview, was based on myth and delusion of the most appalling sort, which sort of grew and grew into a massive web of mutually reinforcing delusions, which were so intertwined in the Germans during the Nazi rule that they became axioms, seeped into the consciousness of the nation. 

*This itself was just another part of the ever-growing body of Nazi delusion. The German forces in late 1918 were near collapse as the Allies advanced on Flanders and rolled back the German offensive at Ypres.