Among other quotes given by Fuller are “Seriously, it would be good for humanity were all books burnt, so that we could bathe in the fresh spring of ignorance. I even think that it is the sole means of preventing human-kind becoming sterile.” and “If Lenin is able to disencumber Russia from the old scrap iron of prejudices and de-westernize her, I will follow him. But he must raze all to the ground, and deliberately hurl us back into barbarism.”
What really animated him was not the paganism of the Slavic Gods, he can have had little time for Wolos anyway and chose Pierounn (often equated with Norse Thor), but the barbarism of the horde. I think in this case some mention of 'horde barbarism' is justified. As Tuchachevski himself said; “The Russian Army is not like yours – the French. It is a horde, and its strength is that of a horde.”
I also think you discount the power and influence of the new religion of communism. Again from Fuller;
In Austria, Czechoslovakia and Germany the workers refused to allow munitions to pass through their countries to Poland. “On August 6 the British Labour Party published a pamphlet which stated that the workers of Great Britain would take no part in the war as allies of Poland.” In Paris, the French socialists, through their organ “le Humanite,” spoke of a “war against the soviet Republic by the Polishi government on the orers of anglo-French Imperialism and cried ‘Not a man, not a sou, not a shell for reactionary and capitalist Poland. Long live the Russian Revolution. Long live the Workman’s International’.”, while in Danzig the dockers refused to unload munitions. Of all European peoples the Hungarians alone were friendly to the Poles because under the hideous regime of bela Kun they had tasted the fruits of the Boleshevik revolution.
Was a defeated Germany ready to resist a victorious Red Army preceeded with revolutionary propaganda in 1920-21 is the question. If you have any doubt about this you must accept the importance of the Battle of Warsaw.