‘Religion is the sigh of the oppressed creature, the sentiment of a heartless world, and the soul of soulless conditions. It is the opium of the people.’ ‘The foundation of religious criticism is: Man makes religion, religion does not make man.

Some of the quotes from Karl Marx on religion are; "The first requisite for the happiness of the people is the abolition of religion." "Man makes religion, religion does not make man... Religion is, indeed, the self-consciousness and self-esteem of man who has either not yet won through to himself, or has already lost himself again."