In some respect, this is how religion/spirituality/blind faith has a beneficial value/survivality (but of course, not all the time):

1. Cognitive adaptation

2. Specific analogy:

Check out this checker-shadow visual illusion from MIT. Or this and that and more. (Isn't psychophysics an interesting field like metaphysics and theoretical physics? To my hysterical friend, they would constitute a sics-sics-sics [666]; LOL.)

An illusion is not necessarily false (or it is relatively true). It is useful/has a survival value in certain contexts. In the same way, blind faith, whether to Allah, Jehova, Bathala, Zeus, Odin, to the trees, the volcanoes, etc., creates: a sense of well being, hope, perkiness, a flood of endorphins, close family ties, self-fulfilling prophecies of success in love and money; morality/ethics/order in society, etc.

In the strictest sense, we can say that our perception of color and time is a consensus/inescapable human/biological illusion that helps us make sense of the world (like the checker shadow, for example). It helps us thrive as a species.

So what is technically defined as an illusion in the field of psychology (in medicine, hallucination is different from illusion, but for convenience, we call them all illusions) is in a way actually an illusion that does not have a survival value; an illusion that is deviant from the consensus illusion. (In as much as we can define illusion in terms of the word "perception," e.g., illusion in psychology is a distorted perception, we can also define normal perception in terms of the word "illusion," e.g., normal perception is a consensus illusion from the vantage point of the field of cognitive adaptation.)

Hinduism (the concept of Maya) must have been correct all along on this point.

Now this soliluquy calls to mind movies like Truman Show, Matrix, and Dark City. In these movies, the protagonists are having a "distorted perception" of reality.