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Animals were doing it long before humans even existed. Some birds will “bathe” in an ant nest because the formic acid excreted by the ants rids them of parasites. There’s even a word for it - zoopharmacognosy.
Long before recorded history, people knew what plants were helpful to treat or cure various maladies. Who knows what possessed the first human to chew on willow bark to relieve pain or reduce a fever? The earliest documentation of it was 400 BCE by Hippocrates, but it was probably common knowledge for much longer than that. The Chinese have been using various herbs to treat disease for at least 3000 years.
It wasn’t any particular scientific discovery that weakened religion. It was the popularity of science fiction that did it. As Arthur C. Clarke put it, “Any sufficiently advanced technology is indistinguishable from magic.” People can now imagine how miracles are done without invoking anything supernatural. We might not have the tech to do it yet, but we have a pretty good idea of potential methods. That has placed a lot of “creator god” religions under pressure. Create life? Tech will eventually do it. Create a world? Sure, tech again. Given enough tech, a solar system can be spawned. Water into wine? We’re halfway there with Kool-Aid. We already have vimanas (those ancient Hindu flying vehicles). We call them airplanes or helicopters. We can destroy a whole city with a single weapon. So why should we worship a supreme being who supposedly did those things?
Assuming we can conquer poverty, religions that survive will be centered around improving the human condition. Worshipping dieties will eventually fall by the wayside. It will still be a long process. You can’t dispel faith with reason and facts. And people in poverty tend to embrace religion because it gives them comfort and hope that things will be better in the afterlife.