1. 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. - Karl Marx 2. The first requisite for the happiness of the people is the abolition of religion. - Karl Marx 3. Religion is the impotence of the human mind to deal with occurences it cannot understand. - Karl Marx 4. Reason has always existed, but not always in a reasonable form. - Karl Marx 5. Religion is the opium of the masses. - Karl Marx Src: (brainy quote)