Answer:
Marx didn´t claim all that; that was more the work of post-marxism.
Step-by-step explanation:
During his entire life Marx investigated the material side of capitalism; production modes and the profits for people with capital. His work was all about economics.
It was after Marx that the Frankfurter School started to investigate capitalist ideology and its social consequences. People like Marcuse and Adorno came up with what is mentioned in the question about key beliefs.