Religion is the sign of the oppressed... It is the opium of the people.

Religion is the opium of the masses.

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.

The first requisite for the happiness of the people is the abolition of religion

The first requisite for the happiness of the people is the abolition of religion.

Religion is the impotence of the human mind to deal with occurrences it cannot understand