One man disobeyed and all sinned (Rom 5:19)
"The Lord fashioned into a woman the rib which He had taken from the man" (Ge 2:22) and they "were both naked and were not ashamed" (:25). But when they ate of the fruit of the tree "the eyes of both of them were opened, and they realized they were naked so they . . . made coverings for themselves" (3:7). They had "become like one of us knowing good and evil" (:22). Did they know being naked as good or evil? They didn't feel shame before, but it seems they did now. They had to replace the innocence of their previous condition with a covering and God, himself, had to make "garments of skin for Adam and his wife" (:21). In Laodicea they didn't know that they were "wretched and miserable and poor and blind and naked" (Rev 3:17). God advises "buy from me . . . white garments that you may clothe yourself, and that the shame of your nakedness may not be revealed" (3:18).
What had Adam done? He was "the one who sinned" (Ro 5:16). What is sin? It is a "transgression" (:15) or "offense" (:15 KJV). It is also a "trespass" (:15 RSV). You've seen signs saying "NO TRESPASSING." "God commanded . . . you shall not eat" (Ge 2:16-17). But Adam violated the command. "Through the one man's disobedience the many were made sinners" (Ro 5:19). The result was "through one man sin entered into the world, and death through sin" (:12). But others "had not sinned in the likeness of the offense of Adam" (:14). Then "death spread to all men" (:12) because "in Adam all die" (1Co 15:22). Sin is the culprit because "the sting of death is sin" (1Co 15:56). "The wages of sin is death" (Ro 6:23). Therefore "sin reigned in death" (5:21) and "death reigned" (:17). "Death works in us" (2Co 4:12). One might respond that everyone has to die naturally anyway. But you should consider "him who had the power of death, that is, the devil" (Heb 2:14).