The demarcation problem is a name for our failure to identify criteria that can distinguish science from pseudo-science, in spite of there being two such things. In the absence of rational criteria, we get clarity on the difference from various institutional-cultural institutions, like the consensus produced by university gatekeepers though peer review (which generates, by definition, peer pressure), grants, prestige, and other stick-and-carrot means. Like most institutions we expect it to do reasonably well (or at least better than an every-man-for-himself chaos) though it will come at a cost of group-think, elitism, the occasional witch hunt etc..
The demarcation problem generalizes to our failure to identify any meta-criterion for what counts as legitimate discourse or belief. Kant’s famous attempt to articulate meta-criteria for thought, which concluded to limiting it to an intuition of Euclidean space distinct from linear time turned out to be no limitation at all, and Davidson pointed out that the very idea of a conceptual scheme – a finite scope or limit to human thought that could be determined in advance – requires us to posit a language that is in-principle untranslatable, which is to speak of something that has to meaning. Heraclitus was right – you can’t come to the borders of thought, even if you travel down every road. We simply can’t articulate a domain of acceptable belief in general from which we can identify the auslanders.
This is true of religion as well. By our own resources we can know there are pseudo ones and truer ones, but the degree of clarity we want in this area is going to have to be borrowed from an intellect other than our own. The various religious institutions are attempts to make up for this deficiency in reason and provide us with clearer and more precise articulations of true religion in exactly the same way that we get it in the sciences. That a westerner tends to accept Christianity arises from the same sort of process that makes him tend to accept scientific consensus. He walks within the ambit of various institutions that are designed to help him toward truth, and they almost certainly succeed at this more than he would succeed if left solely to his own lights. Anyone who thinks he can easily identify true science while no one can identify true religion is right in a sense, but he doesn’t recognize how heavily his belief is resting on institutional power.
Scientific institutions are for now more self-confident and declarative whereas religious ones are more self-questioning and pluralist. There are upsides and downsides to either mode of existence. Confidence is fun but it comes at the cost of the things mentioned in the first paragraph; pluralism is prone to doubt and timidity but it comes with benefits too. The wheel of time might very well flip all this around again and we might find ourselves with a more energetic religion that gets to enjoy confidence but loses the benefits of dialogue. Or not. More love of religion doesn’t give me any light to know which one is preferable.