In fact, Karl Marx, an avid spherical earther, actually thanked Copernicus for giving him a scientific premise for communism/marxism."
As Jaynek pointed out, Copernicus didn't invent the sphere earth, he invented heliocentrism, which is the opposite of geocentrism and has NOTHING to do with the shape of the earth. Secondly, Marx needed Copernicus' heresies as a foundation for communism since heliocentrism destroys/weakens many catholic principles, namely 1) inerrancy of the bible, 2) authority of the church to interpret scripture, 3) the central and important role that man plays in the world and the special love God has for humanity (a love that God does NOT have for "other planets" or "other lifeforms"...which don't exist anyways).
The shape of the earth does not help/hurt Marx and his godless philosophy. But the idea that the earth is "just another planet" and that man is "just another intellectual being" does help Marx for it psychologically degrades man's thinking of himself, his purpose and his importance to God.