We have a collection of 4 Religion quotes from Karl Marx
"Religion is the impotence of the human mind to deal with occurrences it cannot understand." (ID 51385)
"Religion is the opium of the masses." (ID 51404)
"Religion is the sigh of the oppressed creature, the heart of a heartless world, and the soul of soulless conditions. It is the opium of the people." (ID 51426)
"The first requisite for the happiness of the people is the abolition of religion." (ID 51464)