Religion is the opium of the masses.

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

Religion is not merely the opium of the masses, it's the cyanide.

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.

If organized religion is the opium of the masses, then disorganized religion is the marijuana of the lunatic fringe.

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