Suppose that every memory, written word, and piece of technology on earth was destroyed at once, leaving humanity to start from scratch. Everything we have come to know about science would eventually be discovered again. Given a few thousand years, people would figure out chemistry, and rediscover all of the same elements we know about now. People would once again understand biology, including it’s evolutionary origins. People would eventually see that motions of other galaxies in the sky, and work out the details of the big bang.
This is the glorious part about science, it can and would all be replicated. I can assure you, however, that your story about a talking snake would be gone forever.