It was the same war against us. Even in Rome, gladiators and drama served the purpose of TV shows. Still the purpose is now different and much more cruel.
Taken in context, Marx's statement illustrated the fact that religion, and the supposed rewards that Jesus' teaching offered, afforded "hope to the hopeless." Sic: "All of life's hardships will be gone when you reach my father's kingdom", Thus it became, "the opium of the people". As people become more affluent, suffer less hardship, they rend to drift further away from , "religion's necessity". Opiates have the "off label usage", of being "antidepressant".In fact, one of the weaker and least addictive of these, "Tramadol", was even studied for that potential usage. Religion has it's own function as an antidepressant, and thus Marx easily came to his comparative conclusion. .
Organized religion quickly realized its potential as a way to, "control the masses through fear". IDK it it was Plato or Socrates, (or another Greek Philosopher), who said something to the effect that, "any religion needs an unprovable truth and an unprovable punishment to be effective". Organized religion, primarily the Roman Catholic Church, was quick to seize upon this axiom, utilizing it for its own power and enrichment.
Evolution has "gifted" us with mental powers so "advanced", that our egos cannot come to grips with that fact that there is a final "end to our consciousness". This is why we become "easy prey", to the seductive appeal of an eternal,"heaven".
Moving on, most all of society's troubles today, are, (IMHO), caused by the influence and application of propaganda, coupled with the inability of a large segment of the populace to "think for themselves". Advertising incorporates all the propaganda techniques employed by governments to bring about a conclusion that the products they offer will, "enhance our existence", nor can we, "live without them". After which innate human greed kicks in and does the rest of the work for them.
I could go on, but I'm / we're already so far off topic as to be in jeopardy of having these posts pulled. I'm hoping that the mods will overlook that and let them stand.