Though Marx himself rejected idealism and religion, the best explanation on why Karl Marx is so revered in academia, comes in the words of Joseph Schumpeter, who describes 'Marxism' as a religion (this definition seems more relevant when you also consider how the understanding of 'Marxism' has evolved based on the interpretation of different analysts). read more
Marx's tiny organisation, the Socialist League, split and split again. In the end, when there were really only two members left, Marx and Engels, Marx decided to concentrate on his journalism and on expanding the ideas that he and Engels had set out in the Communist Manifesto of 1848. read more