Besides pagan beliefs, part of the NSBM scene embraces an interpretation of Theistic Satanism, depicting Satan as an ancient Aryan counterpart to Yahweh, the god of the Jews and Christians. This view is often called "völkisch Satanism"[42] or "Aryan Satanism".
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If you read nothing else, read that above sentence.
Chraesvelgoron of The True Frost sees Nazism as the political appearance of Satanism and the collective deification of man as a social animal, as godliness instead of humaneness.[43][44] His bandmate Sadorass calls the same ideology a development of blood and soil (völkisch way), diverse occult teachings and the ideas of Friedrich Nietzsche in connection to Darwin's evolution theories.[45] Greek black metal musician Magus Wampyr Daoloth (of Necromantia and Thou Art Lord) said in an interview for Lords of Chaos: "If you consider that fascism and Satanism have a lot of similarities as they both advocate power, spiritual and physical excellence, responsibility, survival of the fittest, elitism, etc., it's logical that some bands advocate both".[46]
However, many pagan and far-right bands see Satanism as a part of Christianity or Judaism.[47] Also, some non-political Satanic black metal musicians hold pagan bands in contempt, and do not recognize them as black metal because their lyrics and ideology do not include Satanism.
https://en.wikipedia.org/wiki/National_Socialist_black_metal