The sin principle they established was forever passed to every person who would ever be born. God sent His Son, Jesus, to die for our sins and to deliver us from them. He came to undo what Adam did.
When we accept Jesus as our Savior, He comes to live in our spirit, and if we allow that renewed part of us to rule our decisions, then we can overcome the sin nature. It doesn’t go away, but the greater one who lives in us helps us overcome it daily (see Gal. 5:16). That does not mean that we never sin, but we can improve and make progress throughout our lives.