The University of Arizona's site hosts a list of books that were banned in Germany in the 1930's. Among them is... take a wild guess...
Writings of a philosophical and social nature whose content deals with the false scientific enlightenment of primitive Darwinism and Monism (Haeckel).
And just for good measure, there's also this:
c) All writings that ridicule, belittle or besmirch the Christian religion and its institution, faith in God, or other things that are holy to the healthy sentiments of the Volk.
That ought to settle the issue. But of course, you know it won't.