"Empirically not true. The "human race" wasn't and isn't a single monolith. Societies across the globe developed independently, each gaining and passing down wisdom while having different or even no religion."
There is no human society greater than a single individual that does not include religion- AT ALL.
Those "arbitrary rules" actually evolve into place, and fit the way human beings survive in a place. You'd do far better to listen than to dismiss out of hand those rules.
"At the worse of times Christianity was partially responsible for the downfall of ancient Rome/Byzantine"
Actually,the rules of Christianity are what they are *because* of the downfall of ancient Rome. And it was Islam that killed the Byzantine empire, which shows how much you know about history.
" There had to be an agricultural surplus first before the voodoo priests can claim they have a special connection to the Gods that helps them magically make the harvest better. "
No, because hunter/gatherer cultures also had religion. You really are ignorant about human evolution, aren't you?
"stagnant in one spot, with little to no advancement."
Prove that what you have is actually advancement, instead of destruction.
"Feel free to elaborate on those ways."
Sustainable happiness for one.
"And if you think being more advanced in those ways makes the Good Old Days better than what we have here, feel free to disconnect yourself from this Internet and the rest our current civilization, gather like minded people, venture into the wilderness, and start your own little simulation of a feudal kingdom."
Anybody who tries that ends up with the federal troops shooting up the place.
"See, that's the great thing about freedom: you're FREE to go and retry the old ways yourself. You just can't force the rest of us to go with you."
Some freedom you have there. The freedom to be a slave.