And that requires discussing the role of myth across cultural and historical boundaries.
This is becoming a little comical as both of us feel the other is not looking at religious belief as a whole.
Your view seems to be heavily distorted by the role of myth in US Protestantism where scripture was a definitive 'instruction manual' and could be understood in a literalist sense purely with reference to itself.
When focusing on Abrahamic scripture, whether one takes a literal or metaphorical approach, there are specific prescriptions, namely a belief in the creator entity, and while individuals may have personal doubts about the existence of the creator entity, scripture in no way encourages questioning its existence.
And really, it doesn’t matter. We are in agreement that religious myths are narratives that are not objectively true, that religious myth changes over time, and that religious myth often becomes tightly intertwined throughout a society's belief structure. We can trace how changes in either society or religious myth can affect both.
This goes back to any medium, sized tribe, not 'complex societies'. Tribal societies have a mythical 'common ancestor' as any group who could expand more than actually genetically related people would have a massive survival advantage.
Building a larger group has far more evolutionary benefit than a 'god of the gaps'.
And yet we did not start out as medium sized tribes. I am not arguing that creating fictive kinship groups is not required for larger groups or that larger groups do not confer greater chance of survival.
Regardless of the size of the society and its complexity, there will always be the unknown and the risk of uncontrollable events. For this reason, there will always be a need for “myths of the gaps”. Our earliest, most primitive “myths of the gaps” simply evolve and change as societies evolve and change.
They are susceptible to illusions because they don't see the world as it is.
It is not objective data, it is subjective. Our senses develop from experience as our brains have to give meaning to the signals that we receive. Your brain is also constantly filling in gaps in this information, which is one cause of optical illusions.
If you have had a normal upbringing, your senses will tend to give a useful representation of what is out there, but if you raised a child in a strange experiment where you were constantly distorting their sensory perceptions then they would end up seeing the world very differently from you.
If we saw the world 'objectively' this would not be possible. It would also be an evolutionary disadvantage.
I think you should give this a little more thought. Vertebrate senses provide objective, if not complete, information about the world around the organism. Absent abnormalities, the biological senses provide reliable information within the specific ranges (visible light spectrum, audible range of sound waves, specific chemical receptors). Our senses do not develop, they are what they are, what develops is our catalog of experience, where we see the patterns in the data and we begin to catalog the objects we encounter along with our experiences.
When presented with limited information, the central nervous system will try to find a likely match. The obvious advantage is that it allows the organism to react faster than waiting for complete information to come in, either in identifying threats or potential food. The advantage of quick reaction outweighs the disadvantage of misidentification. Again, given close and careful inspection of something, maximizing the observable data of the thing in question, allows for accurate, objective conclusion at a macroscopic level.
For human beings, the sensory data is objective, it is what we think about that data that is subjective.
Much of scripture wasn't even designed to be scripture, let alone an immutable doctrine to be interpreted literally.
If you look at the Bible, it was written over centuries by various authors who were (re)interpreting and playing with existing traditions. Why should we consider that these authors thought they were creating definitive texts with permanently fixed, literalist meanings?
The books that later became the New Testament were not even considered scripture for several generations, and weren't even textually consistent, never mind fixed in meaning:
The second-century church tended not to conceive of the Gospels as discrete, theologically-shaped literary entities; this is a more modern notion of them. Narrative and sayings material even in Justin’s day represented separate streams of oral tradition, and these strands of Gospel material continued to have a life of their own separate from their joint literary incorporation into written Gospels. Consequently, it is possible, even natural, for the second-century [c]hurch of Justin’s time to think of the logia [sayings] of Jesus or the events of his life quite apart from the evangelical [i.e. Gospel] literature and to conceive of the Gospels as mere guardians of such tradition. The ‘orthodox’ Gospel literature represents not so much right interpretation, although this is not entirely absent, as correct circumscription and preservation
John Barton - A History of the Bible
I guess you've never heard of apophatic theology then
The statement God exists is cataphatic (it is a positive claim about god), where many apophatic theologians would refuse to make such a statement as statements about god can only be negative (he was not created, he is not human, etc).
Orthodoxy tends to develop over time as 'acceptable' doctrine narrows and becomes reified.
I have used scripture to broadly mean any religious text which may be an inaccurate use of the word. The fact is that these texts describe religious myth, myths that are not objectively true, that can evolve and change over time as society changes, and that in part, provide answers to unanswerable questions.
As for apophatic theologians, they are not questioning the existence of their creator entity. It still starts with the assumption of a perfect entity, that first and primary myth, the need of which is to answer those unanswerable questions.