In The Future of an Illusion, Freud made the obvious point that religion suffered from one incurable deficiency: it was too clearly derived from our own desire to escape from or survive death. This critique of wish-thinking is strong and unanswerable,

A general limitation of the human mind is its imperfect ability to reconstruct past states of knowledge, or beliefs that have changed. Once you adopt a new view of the world (or of any part of it), you immediately lose much of your ability to recall what you used to believe before your mind changed.

Deficiency in judgement is properly that which is called stupidity; and for such a failing we know no remedy. A dull or narrow-minded person, to whom nothing is wanting but a proper degree of understanding, may be improved by tuition, even so far as to deserve the epithet of learned. But as such persons frequently labour under a deficiency in the faculty of judgement, it is not uncommon to find men extremely learned who in the application of their science betray a lamentable degree this irremediable want.]

Few minds are spacious; few even have an empty place in them or can offer some vacant point. Almost all have narrow capacities and are filled by some knowledge that blocks them up. What a torture to talk to filled heads, that allow nothing from the outside to enter them! A good mind, in order to enjoy itself and allow itself to enjoy others, always keeps itself larger than its own thoughts. And in order to do this, these thoughts must be given a pliant form, must be easily folded and unfolded, so that they are capable, finally, of maintaining a natural flexibility.

All those short-sighted minds see clearly within their little ideas and see nothing in those of others; they are like those bad eyes that see from close range what is obscure and cannot perceive what is clear from afar. Night minds, minds of darkness.

"There is, we are aware, a philosophy that denies the infinite. There is also a philosophy, classified as pathologic, that denies the sun; this philosophy is called blindness. To set up a theory that lacks a source of truth is an excellent example of blind assurance. And the odd part of it is the haughty air of superiority and compassion assumed toward the philosophy that sees God, by this philosophy that has to grope its way. It makes one think of a mole exclaiming, "How I pity them with their sun!" There are, we know, illustrious and powerful atheists; with them, the matter is nothing but a question of definitions, and at all events, even if they do not believe in God, they prove God, because they are great minds. We hail, in them, the philosophers, while, at the same time, inexorably disputing their philosophy."

I have seldom met an intelligent person whose views were not narrowed and distorted by religion.

We end up populating what we call the intelligentsia with people who are delusional, literally mentally deranged, simply because they never have to pay for the consequences of their actions, repeating moderniest slogans stripped of all depth...The principle of intervention, like that of healers, is first do not harm; even more we will argue, those who don't take risks should never be involved in decision making (p.10).

Their three flaws 1) they think in statics not dynamics 2) they think in low, not high dimensions 3) they think in terms of actions, never interactions....The first flaw is they are incapable in thinking in second steps and unaware of the need of them...The second flaw is that they are also incapable of distinguishing between multidimensional problems and their single dimensional representations. The third flaw is they can't forecast the evolution of those one helps by attaching, or the magnification one gets from feedback. (p.9)

how can it be that the modern human mind is capable of precise logical analysis, and yet simultaneously permits us to accept religious beliefs that should crumble beneath even the slightest rational scrutiny?

One of the monumental ironies of religious discourse can be appreciated in the frequency with which people of faith praise themselves for their humility, while condemning scientists and other nonbelievers for their intellectual arrogance. There is, in fact, no worldview more reprehensible in its arrogance than that of a religious believer: the creator of the universe takes an interest in me, approves of me, loves me, and will reward me after death; my current beliefs, drawn from scripture, will remain the best statement of the truth until the end of the world; everyone who disagrees with me will spend eternity in hell... An average Christian, in an average church, listening to an average Sunday sermon has achieved a level of arrogance simply unimaginable in scientific discourse - and there have been some extraordinarily arrogant scientists.

Morality is the weakness of the mind.

The capacity of the rational mind to deceive, manipulate, scheme, trick, falsify, minimize, mislead, betray, prevaricate, deny, omit, rationalize, bias, exaggerate and obscure is so endless, so remarkable, that centuries of pre-scientific thought, concentrating on clarifying the nature of moral endeavour, regarded it as positively demonic. This is not because of rationality itself, as a process. That process can produce clarity and progress. It is because rationality is subject to the single worst temptation — to raise what it knows now to the status of an absolute.

I had rather believe all the fables in the Legend, and the Talmud and the Alcoran, than that this universal frame is without a mind... A little philosophy inclineth a man's mind to atheism; but depth in philosophy bringeth men's minds about to religion. For while the mind of man looketh upon second causes scattered, it may sometimes rest in them and go no further; but when it beholdeth the chain of them, confederate and linked together, it must needs fly to Providence and Deity.

the mind that has convinced itself of its own superiority is incapable of humility, and in the absence of humility, it is incapable of growth.

Intelligence arouses fear and respect, the lack of it keeps one on the narrow minded road of disrespect, stupidity and inferiority complex.