knowledge ≠ rationalness and it wasnt PHYSICAL death, it was spiritual death.

You didn't answer the question. How can you reason without knowledge? How could adam and eve have rational souls before eating from the tree that gave them knowledge and before truly understanding the consequences?

God created satan as an angel of light, but he was corrupted by sin, especially the sin of pride

But god knew this was going to happen, right? Is god incapable of creating sinless beings? Is sin more powerful than god? Because it seems like shoddy craftsmanship to create something with a fatal flaw.