In the 18th and 19th Centuries, you had German philosophers and theologians who attempted to remove God from the centerpiece of German life. Some thought the Lord made man perfectable, some simply went for the end of belief in God.
The Germans I've met over the years are extremely intelligent...and have NO belief nor faith in God, even ones who are clergy. Most are humanists of one form or another. Their turning away from God and turning to their own superiority has led Germans to be very arrogant about their superiority, and this has been long before the Nazis and continues to this day.
They can be extremely intelligent but they can be also "extremely blind."
The USSR preached humanism too.
And much of what Marx wrote was antisemitic, proclaiming the god of the Jews to be “money”.