As many indigenous folks have argued (for example, deloria jr. in "Same old Rock" in Marxism and Native Americans) Marxism is itself a religion that demands taking a lot on faith (revolutionary optimism is faith; belief in revolution is faith; belief in an eventual better world in the future? Faith.

If Marxism is not a science, it is merely an affectation that has no particular reason to be held as better or worse than other "lenses" of analysis like Lacan or whatever. The most basic point of "scientific socialism" is that it is attempting to be a science, and to discard that is to discard the heart and be left with a corpse.

https://archive.org/details/075_Marxism_as_a_Science_FINAL.lite