Maybe not an opiate for fools -- but just untrue.
“[T]he principal objection which a thinking man has to religion is that religion is not true – and is not even sane.” – E. Haldeman-Julius, The Meaning of Atheism
& another favorite:
“There exists, finally a somewhat numerous class of honest but timid souls who, too intelligent to take the Christian dogmas seriously, reject them in detail, but have neither the courage nor the strength nor the necessary resolution to summarily renounce them altogether. They abandon to your criticism all the special absurdities of religion, they turn up their noses at all miracles, but they cling desperately to the principal absurdity; the source of all the others, to the miracle that explains and justifies all the other miracles: the existence of God. Their God is not the vigorous and powerful being, the brutally positive God of theology. It is a nebulous, diaphonous, illusory being that vanishes into nothing at the first attempt to grasp it. And yet they hold fast to it, and believe that, were it to disappear, all would disappear with it. They are uncertain, sickly souls. They have neither the power nor the wish nor the determination to follow out their thought, and they waste their time and pains in constantly endavoring the reconcile the irreconcilable. With them, or against them, discussion is out of the question. They are too puny.” – Mikhail Bakunin, God and the State
-B.