One of the principal ambitions of Marxism is to turn the glance of the man of the sky to river on the earth. Indeed, Marxism wants to be an anti-metaphysical theory, a philosophy of concreteness, of the criticism of fideism, of idealism. In their philosophical project, Marx and Engels rebel against Christianity and, consequently, against any thought which makes it explicitly or implicitly a certain reception. Would Marxism and metaphysics then reject each other back to back? This book, by questioning the Marxism of Marx and Engels, proposes another vision of the relationship between Marxism and metaphysics. The result it reaches is that Marxism has not succeeded in its anti-metaphysical enterprise, insofar as it has not even been able to eradicate it from within. Historical materialism, or dialectical materialism, is nothing else than a metaphysics that refuses to accept itself as such.