Marxism is a religion.

Here's the legal definition of religion.

"Religion can be defined as a comprehensive belief system that addresses the fundamental questions of human existence. Such as the meaning of life and death, man's role in the universe, and the nature of good and evil. And that gives rise to duties of conscience."

This is precisely what Marxism does and preaches. Man's roll in the universe, the nature of good and evil, and duties of conscience.

Marxist critical theories require a praxis by definition ... which is the "duties of conscience" part.