Which theorist believed that religion was the opiate of the masses?

Name: Which theorist believed that religion was the opiate of the masses?
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Karl Marx is the theorist who famously described religion as the "opiate of the masses," arguing that it was used to keep the working classes passive and maintain the status quo by promising rewards in the afterlife rather than seeking justice and equality in the present world.

Which Theorist Believed That Religion Was the Opiate of the Masses