Occam's Razor
Occam's Razor is a basic scientific principle which says, all things being equal, the simplest explanation tends to be the right one.
So what’s more likely?
An all powerful and mysterious God created the Universe, and then decided not to give any proof of his existence, or that he simply doesn't exist at all, and that men created the idea of God so that they didn’t have to feel so small and alone?
What if science simply revealed that God never existed in the first place? Would you have a problem with that?
This "question" has "plagued" mankind throughout history. Some men don't believe in God and don't know why they don't. Some men do believe in God and don't know why they do.
What if, it's this very question that is primarily responsible for the growth and development of those two features of the human animal that makes him utterly different from the other non-human animals - emotion and intelligence.
Instinctively, and bodily, many kinds of animals demonstrate more capabilities than humans - some can live longer, live and breath under water, fly, jump higher, are much stronger, etc.
But, emotionally and intellectually, none of the non-human animals on this planet even come close. (Don't bother trying to argue this one, if you can't realize the truth of that, then you don't belong in this discussion.)
So, given the possibility that the above is "correct enough", perhaps the question of the existence or non-existence of God, and the question of emotional faith and intellectual proof, are the chief means through which mankind "grew" his emotional and intellectual capacities (i.e., expanding his nervous system into those two higher circuits), and that without that one question, it could be said - with a straight face - that man would in fact be no different than any other animal on this planet.
If you can "accept" the above as a legitimate premise, then the next mind-blowing (expanding) question could be: What question, therefore, would/could be responsible for growing the nervous system into the next circuit, the 4th circuit which is not yet ordinarily functioning in man?