My personal perspective is we forget because doing the right things for the wrong reasons, hoping for punishment or reward, is wrong. And also because variables change over time, so the lessons can’t be presented in the same way. For instance the difference between common core multiplication and memorizing the tables.

Or another example, the periodic tables contain n elements at one time, x elements another.

So even if I remember the periodic tables from when I learned it (I don’t!), they’ve changed in the decades since, so my knowledge is incomplete. Assuming I had the physical, mental, financial and material capacity to become a physicist, should I choose, I have a lot to relearn, unlearn, and learn new things, additionally. And that’s just this lifetime.

I appreciate your non-hostile inquiry style. Thanks so much. Btw these things don’t require God. It’s just an allegorical tool. Just like communism has many approaches and corruptions as there are minds to conceive them, so too religions. Even Buddhism and Taoism.