Geertz, The Interpretation of Cultures, “Religion as a Cultural System” [available online]:

The thing we seem least able to tolerate is a threat to our powers of conception, a suggestion that our ability to create, grasp, and use symbols may fail us, for were this to happen, we would be more helpless, as I have already pointed out, than the beavers. The extreme generality, diffuseness, and variability of man’s innate (that is, genetically programmed) response capacities means that without the assistance of cultural patterns he would be functionally incomplete, not merely a talented ape who had, like some underprivileged child, unfortunately been prevented from realizing his full potentialities, but a kind of formless monster with neither sense of direction nor power of self-control, a chaos of spasmodic impulses and vague emotions. Man depends upon symbols and symbol systems with a dependence so great as to be decisive for his creatural viability and, as a result, his sensitivity to even the remotest indication that they may prove unable to cope with one or another aspect of experience raises within him the gravest sort of anxiety:

[Man] can adapt himself somehow to anything his imagination can cope with; but he cannot deal with Chaos. Because his characteristic function and highest asset is conception, his greatest fright is to meet what he cannot construe — the “uncanny,” as it is popularly called. It need not be a new object; we do meet new things, and “understand” them promptly, if tentatively, by the nearest analogy, when our minds are functioning freely; but under mental stress even perfectly familiar things may become suddenly disorganized and give us the horrors. Therefore our most important assets are always the symbols of our general orientation in nature, on the earth, in society, and in what we are doing: the symbols of our Weltanschauung [world view] and Lebensanschauung [life view]. Consequently, in a primitive society, a daily ritual is incorporated in common activities, in eating, washing, fire-making, etc., as well as in pure ceremonial; because the need of reasserting the tribal morale and recognizing its cosmic conditions is constantly felt. In Christian Europe the Church brought men daily (in some orders even hourly) to their knees, to enact if not to contemplate their assent to the ultimate concepts. (Langer, Philosophy in a New Key)

There are at least three points where chaos — a tumult of events which lack not just interpretations but interpretability — threatens to break in upon man: at the limits of his analytic capacities, at the limits of his powers of endurance, and at the limits of his moral insight. Bafflement, suffering, and a sense of intractable ethical paradox are all, if they become intense enough or are sustained long enough, radical challenges to the proposition that life is comprehensible and that we can, by taking thought, orient ourselves effectively within it — challenges with which any religion, however “primitive,” which hopes to persist must attempt somehow to cope.