This is from Adolf Hitler 'Mein Kampf'
Hence today I believe that I am acting in accordance with the will of the Almighty Creator: by defending myself against the Jew, I am fighting for the work of the Lord
An interesting quote from a supposed godless person, granted he wrote the book in 1927, before his rise to power, so his views could have changed by then
If Hitler believed in a deity at all, it was very much a pagan one; an embodiment of the German volk, and the metaphysical mission he foresaw for them.
The nazi credo orginated from a mad brew of neo paganism, and the scientism that had dominated victorian and edwardian atheist radicalism; go check on George Bernard Shaw, HG Wells and other such luminaries of that era.
From them you'll find links to others whose names currently escape, and it's all there; eugenics, liquidation of the unfit, scientific racism, virulent anti semitism and anti christianity as well as expressed admiration for fascism as it emerged, alongside bolshevism - until all the post war revisionism, there were in many cases, no qualms among left wing radicals as recognising both as embodiments of their ideals.
I have said before, the defining quality of atheist left wing radicalism has been the aspiration to transform man into god; an almost crassly freudian response to the rejection of man as a creation of god. The pursuit of the new man, shaped through nature or nurture was consistent across nazism and communism, each of which contained enthusiasts for both. Each side of the equation led to genocide; nature in europe, nurture in Cambodia.
Once more, this does not mean atheists are disposed to become nazis. But social and political philosophys that have been consciously a-theistic, have always led to mayhem. This has both negative and positive drivers i think; a positive effort to achieve a utopia of perfected humanity and a negative driver in that restraints are removed.
Thankfully humanism is now the dominant philosophy. One that can't claim the same rigour in attempting to ground it's premises purely in scientific reason, it being the 'alcohol free lager' of christian denominations, but which is consequently much less brutal.
We'll see if that holds as the horrors of c20 recede into the past. Eugenics is already back, practised in utero, and I won't be surprised to see it return more fully. The shrill voices of those wishing to marginalise religion, close faith schools and so on, are echoing some of the first steps common to these 20th century movements.
These tropes are powerful btw, and sucked in religious people despite their complete contradiction of christian teaching; individual failings happened all over germany and full blown syncretic combinations of catholicism and orthodox christianity and volkisch nationalism were present in croatia and romania respectively, while the nazis scientific racism and post marxist analysis of the jewish problem was able to exploit europe's traditional anti semitism, a toxic brew of christian prejudice and plain old out group hatred, an eternal aspect of human nature, which has otherwise been somewhat softened by monotheism.