For a society of commodity producers, whose general social relation of production consists in the fact that they treat their products as commodities, hence as values, and in this material form bring their individual, private labours into relation with each other as homogeneous human labour, Christianity with its religious cult of man in the abstract, more particularly in its bourgeois development, i.e. in Protestantism, Deism, etc., is the most fitting form of religion
Karl Marx, Capital, Volume 1.