Marxism and Christianity only share the fact that they contain frameworks for analyzing material reality(Marxism through Materialism and Christianity through representing reality as though it is divine, and thus explainable via the divine), and this post seems to not be willing to honestly engage with Marxism as a concept.
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Marxists do not oppose incremental change. Marxists believe that minor concessions under Capitalism are insufficient to actually fix the underlying problems, and this point of view is built on a thorough understanding of the Marxist critique of Capitalism.
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Marxists do not oppose reform, they just believe it is impossible to do successfully without sliding backward, because the state is built in a manner that supports Capitalism and resists change.
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Marxism is an economic critique of Capitalism, a philosophical framework, and a call to action. It is a complete set of tools to look at the world, analyze it, and how to fix it. In this manner, it can be superficially compared to Christianity, but only on the surface.
That's really it.