OK, let me try again, from the beginning; Clearly Marx recognised that religion teaches contentment "the opiate of the people" and suggested that is a bad thing, as in it insidiously undermines society and promotes apathy in the face of a government that feeds off them.
I disagree with his interpretation of what contentment, and by extention religion, means to society; it's certainly no stretch to say "Contented people = peaceful people" and if we extend the drug analogy, some drugs are more insidious than other's; for instance, a drunken bloke slam's down his pint and says "right, you're going down" because he doesn't agree with a perfectly reasonable thought; meanwhile a stoned bloke says "na, your alright mate, you wanna toke".
Bearing in mind, how the Russian revolution worked out; was it better before or after, and for whom?