Romans 5:12-21 talks about sin coming from one man, Adam, bringing death, and the gift coming from one man, Jesus, bringing eternal life. It's a long section to say something pretty simple for me to understand. Because of the sin of Adam, death due to sin began. And all men after Adam, which is to say every human who ever lived, is living, and will live, had/has/will have sin. That sin brings death. Jesus was the only man to live sinless, and only because He is God. Jesus died despite His sinless-ness to pay the price for our sins. This gift was given as justification for us to have life instead of death. Of course, we all still die here on earth but with faith in God we live eternally with Him in Heaven, instead of eternally dying in Hell separated from Him.
Since I'm being serious today I'll say this: DON'T BLAME ADAM FOR YOUR SIN. Every man on earth sins. "All have sinned and fall short of the glory of God." (Romans 3:23) But that isn't the point. "The wages of sin is death, BUT the free gift of God is eternal life in Christ Jesus our Lord." (Romans 6:23) That's the point. Jesus gave us a free gift. And the final verse of the day Jesus said these words, "For God so loved the world, that He gave His only Son, that whoever believes in Him should not perish but have eternal life. For God did not send His Son into the world to condemn the world, but in order that the world might be saved through Him. Whoever believes in Him is not condemned, but whoever does not believe is condemned already, because he has not believed in the name of the only Son of God." (John 3:16-18)
Praise God for the Free Gift of Him only Son.