It doesn’t matter as some one still had to make up the first religion, superstitious or not. Everything on earth was invented by somebody and all theories or beliefs were invented by some body at some time. Things don’t just come into being on their own or created by a god.
And the first person to create a religion has to design it to suit him as no god inspired him since there is no god unless of course you have doubts there might be. (that would be agnostic.)
Even the use of the club some one had to invent the idea. The use of fire some one had to invent how to use it.
Religion, some one had to invent shamans, priests and medicine men and their duties because neither came out of the air or was created by a god.
Man invented every religion even though they believed fire was a god and water was a god. The sun worshiping religion was invented by a man or group of men with their own dogma and every religion upon the face of the earth had to have had a founder or it would not have come about on its own falling out of the sky or created by a god.
However theist believe either God or Satan created every religion. Most atheist believe man invented them. Agnostic aren’t sure one way or the other.
I can’t tell you how to think and you are going to think the way you believe no matter what I say because your mind is made up. That is called free will.
I don’t even expect you to believe in me or anyone else, but I too have free will and I believe in logic and logic tells me that man not God invented religion and he invented it with his own little quirks and ideas rather those ideas he made up or he believed a “god was speaking to him through his thoughts” he none the less invented that religion.
As for the bible I believe the Christian part of it was invented to control and therefore the inventors knew it was a hoax knowing gullible people were bound to believe it.
As for Buddha I do not believe he thought he was inventing a religion but a way of life and people begin to believe it was a religion and added on to it over time.
Some religions were never intended to ever be religions but evolved into them and some religions were invented by people who might have believed in the beginning they were “inspired” but over time lost the illusion but could not quit because of all of the time and work they had already put in it.
And some believed themselves as a prophet but in time became non believers and never wanted anyone to know the truth of the foundering of that faith because of being embarrassed so they said they made it up as a hoax when in fact they didn’t.
Then there are the few who did make it up from the beginning as an experiment much as CFI uses this forum as an experiment and may or may not be either atheist or theist but riding the fence.
But I believe regardless that every single religion some one invented it inspired, experimenting, theory or for whatever reason that religion was invented by an inventor and that no super invisible being instructed anyone to put it together, and I believe while fine tuning it that threw in their own custom made dogmas and added their own theories without qualms.