While I'm sure there is lots that can be added, I would recommend perusing this part of the FAQ about Nazis and the occult!

Part 1:

During the late nineteenth century, before Hitler was born, a new wave of historical interpretation and spiritualism was sweeping across Europe. Charles Darwin’s The Origin of Species challenged the teachings of the Bible and proposed new evidence for evolution and biology. Around this time, popular occult writer Helena Blavatsky published The Secret Doctrine in 1888 and proposed the idea of an ever evolving races of super humans. Her popularity reached across Europe, which is important because it popularized occult beliefs, accumulated followers and admires. Vienna during this time was a major center for the occult, with many occult societies and individuals operating within it. One such admirer was a native Viennese named Guido von List. For forty years he studied German history, folklore and runes, which he used to conclude that a prehistoric race of men called the Aryans had once ruled over all other ‘slave’ races and were evolved from the ‘root’ races that Blavatsky describes. List spent his life creating his ideas around the Aryan master race, in his narrative the modern Germans were decedents from the prehistoric Aryans. The Aryan myth of master and sub races of men is a hallmark of Nazi ideology and many use List’s theories as a way to attach occult beliefs onto the National Socialist movement.

List was much admired and was influential within Germanic oculist groups. His work influenced many groups in Austria and Germany; one of which was called the Bavarian Thule Society. This occultist organization dedicated itself to reviving old Germanic culture. The Thule Society is important because in 1919 it branched out into politics with its own party called the National Workers Party. This party would be renamed in 1920 into the National Socialist Workers Party, the same party Hitler took charge of. This is the sort of link that pseudo historians would use to connect occultism as having influenced Nazism but if we look closely we will find this is not the case. When Hitler took control of the party he showed complete disinterest in the ideas of ancient Germanic institutions and traditions. The Thule Society and the Germanenorden were devoted to an Aryan-racist-occult cultural complex but under Hitler the party stressed the defeat in WWI, the betrayal of Germany by politicians, and bitter anti-Semitism in their platform and propaganda. Also, there is no evidence that Hitler ever attended a meeting of the Thule Society. The link between List and Hitler is a speculative one, not grounded in any hard evidence. In any case, List’s racist and speculative writings had major implications on another man named Jorg Lanz von Liebenfels.

List’s writings attached themselves to the ideas of Ariosophy, the subject of many Aryan-esoteric beliefs. Ariosophy can be defined more or less as a belief in a quasi-monist psychic energy, identical with God, which animated the entire universe but found its manifestation in the blond-haired, blue eyed Aryan and that all cultural achievement in the world could be traced to an Aryan origin. Belief in Ariosophy reinforced the ideas of superiority that Austrian and German racists held. Lanz von Liebenfels, an ex-Cistercian monk, championed the ideas of Ariosophy more than any other man. Liebenfels’s conviction to the goal of racial purity and Aryan mastery propelled him to publish a magazine called Ostara in Vienna. Just like List, Liebenfels ideas on the Aryan master race have similarities to those that were proclaimed by the Nazis. There is a suggestion that Hitler gained his racist views from the literature of Liebenfels. Liebenfel himself claimed in 1951 that he meet Hitler and a witness, Josef Greiner, claims Hitler had volumes of Ostara in his room. Taking the evidence that has been provided for a Liebenfels-Hitler connection, we must now put scrutiny to this charge and examine it closely. While it is true that Hitler was residing in Vienna at the same time as the publication of Ostara and it is possible for Hitler read the magazine but in Hitler’s own musings he portrays himself as an original thinker and impervious to the influences of others. While the two men share ideas about the Aryan master race such as the blond-hair and blue eyes and Aryans being the source of all progress while lesser "races" subverted and corrupted humanity; however they disagree on other matters. Liebenfels supported an Aryan state under Habsburg rule which was to be based in Vienna, Hitler on the other hand hated the Austrian dynasty and looked towards Germany for the center of his civilization. Libenfels was deeply inspired by Christian ideals like prayer and communion which did not appeal in the slightest to Hitler. Also, the Gestapo supressed Libenfels and other occultist from publishing their works which showcases a divide between the two competing racial theories. This evidence should express that Hitler did not entirely agree with Libenfels, the two men only truly agreed on the racial purity aspect. To return to the witness Josef Greiner, under closer scrutiny his story must be taken cautiously. Greiner published a post-war biography on Hitler but within it many historical inaccuracy have been found especially concerning dates and timetables. This has made Greiner's reliability questionable. The only evidence to bare any weight is Libenfels account of meeting Hitler but we do not know if Hitler gained his ideas of the Aryan master race from him or that they simply share some ideas. Libenfels claimed in 1932 that Hitler was one of his pupils. It is strange though for a man like Hitler, who claims to be the German messiah, to be some pupil of a marginalized mystic. The fact is that Hitler never mentions Libenfels in any documented form either in writing or speech.