now I find myself thinking that religious people are gullible or stupid to believe stuff that is closer to fairy tales than reality.
There is a difference between being delusional, and being stupid.
To prevent yourself from feeling too superior to the religious, you have to consider a few key truths.
FEAR FIRST
People fear the unknown because the unknown has the potential of hiding a threat to your survival to which you are blind, and therefore, vulnerable.
People fear death.
This has nothing to do with intelligence... It is an evolved response because animals that don't fear death don't do well in the natural selection game.
HUMANS SURVIVE BY MODELING REALITY
Humans are not big, nor armored, nor even well armed... what we got thru evolution was the ability to symbolize reality in our minds as a complex model that is based upon comprehension of cause and effect. This ability to identify causes, and create a 'theory' of how things work that enables up to imagine a variety of future results based upon a variety of our actions has turned out to be a very powerful survival tool.
Everything we have built, as humans, was built by employing this faculty.
RELIGION AND SCIENCE SERVE THE SAME PURPOSE
Throughout history, human beings have been confronted with unknowns they could not decipher. Early on, we had not even written language nor math apply to these problems, from pestilence to birth... to the lights in the sky... we had no idea what caused them, and no way of finding out.
And as stated above, the unknown is something of which we are afraid.
Someone came up with the trick of simply making up an explanation... be it spirits or god, to cover all those things that we found threatening, but that we could not actually figure out.
And, evolutionarily... it turns out that BELIEVING you understand a threat that you have no real power to mitigate is actually a better survival strategy than curling into a ball and refusing to risk venturing out.
Sacrificing a cow to try and alleviate a drought will not work, but it might give your people the feeling that they are proactively addressing the threat.
So religious societies thrived because religion offered people the feeling that they had SOME control of events beyond their control.
You didn't have to just 'take it'... you could pray... and if nearly everyone is praying, then nearly all the survivors will be folks who prayed... and that seems to verify their beliefs.
Science serves the exact same purpose, it seeks to give us explanations for the unknown, to dispel our fear of it and make us feel we have some control over it.
Science actually does a much better hob, because it actually does find out why things happen, rather than merely inventing a comforting belief.
But Science, itself, was not even possible until the advent of computational math, and the ability to write down everything that each individual discovered and measured...
Science is complicates and requires this form of meta-mind to solve astonishingly nuanced problems.
And Science does require one very hard thing... facing up to not knowing about the unknown... the open and honest acknowledgment of what you do not know, yet.
Both science and religion try to address our fears of the unknown... one simply is a lot harder to pull off than the other.
SCIENCE IS A RELIGION
But the real hard part is that science is so arcane and so removed from ordinary life and experience that most people have no real understanding of it.
For most of us, the pronouncements of scientists are indistinguishable from papal encyclicals. That is, they are both things for which the lay person has no direct proof or understanding... both situations where an 'authority' is asking you to 'trust' what they are telling you.
Sure, you can always get yourself an education and DO the science and prove the results to yourself... but you know that ain't gonna happen.
So the public is presented with two competing world views.
Science says that you have to get comfortable with the fact that you don't understand most of reality, so that you can accurately understand SOME of reality, and it tells you that in a lot of respects, you are at the mercy of the unknown... just a tiny fleck of matter in an indifferent universe.
Whereas religion is saying that you actually CAN understand the whole world, and that they already have the perfect answer to the unknown. AND religion is trying to tell you that you are not powerless in the face of a vast cosmos, but actually have the option to plead influence on the entire thing thru you own proactive means.
Science offers real, but severely limited personal power.
Religion offers unreal, but psychologically unlimited power.
Science almost nobody can really understand.
Religion is an answer everyone can understand.
And human beings have 100,000 years of evolutionary advantage for shaping our minds to be accepting of the religious solution, contrasted to only two thousand years of science.
When you offer any large group a choice between acceptance of a fearful unknown and your own powerlessness, OR an much easier explanation that is delusional, but offers you complete understanding and the ability to influence the unknown... the majority will naturally choose to feel they understand the world and can act in their own interests.
It literally makes it easier to face their day and sally forth to have a sense of certainty in their own powers.
The religious are not necessarily stupid. They are, like anyone else, looking for answers...
The religious decide they have found them....
The scientific are willing to admit they have not.