Fable??
I gave you links to scientific evidence and it is not practical to provide you every thing there is on this research. I know there are lots of research going on re this topic thus my suggestion you research on it to establish its truth.
The potential is a universal one because it is embedded in the human DNA.
That the majority of humans are religious i.e. 6+ billions out of 7 indicate they had to rely on religion’s soothing juices to relieve those existential pains [majority subliminal and otherwise].
Note my point above re majority.
As I had stated the brain has an independent function that produce feel good juices for various reasons, i.e. sex, food, security, existential, etc. Religion is related to the existential reason.
The potential of the existential angst is universal and it is active in the majority of humans. The majority of these tend towards religions while others resort to secular work, etc. and many turn to various drugs, hallucinogens and this is why there is an abuse of opioids to relieve the brain pains which cannot be pin pointed precisely.
The brain creates God and the related feel good juices to relieve the existential angst. The brain do not create a no-God state but rather it is just indifferent to a God-solution. Those who are indifferent to a God idea turn to other means as stated above to relieve their mental pains.
The point is there is no pre-existing real God waiting out there for humans to believe and cling to it.
The real thing is humans invent the idea of God to relieve their inherent and unavoidable psychological pains.
Note it is very common for people with mental discomforts to invent imaginary beings to relieve the discomfort [children imaginary friends] or promote pleasure [sexual fantasies in the mind] and also cling to various beliefs and ideologies.
Note your alternative, i.e. God exists as a real being out there and for a majority, God is a being who can promise them eternal life in Paradise and for some with a bonus of virgins thrown in. From there the claims for God get more and more ridiculous, irrational and absurd.
Top it all no one has been able to prove God exists convincingly since the idea of God emerged.
As I have shown with proofs and evidences the idea of God was conjured to trigger soothing juices to relieve the inherent existential pains.