But sociology describes ideas, not material properties
This is a fundamentally idealist way of viewing sociology, although most sociology you’re exposed to is idealist in nature.
Anyway, my point was that neither a system of government/economy nor pushing ideas are ways of describing the world.
??? What does that have to do with Marxism? I think the disconnect here is that you do not understand what Marxism is, you have only had second and third hand exposure to it.