John -18 For God so loved the world that He gave His only begotten Son, that whoever believes in Him should not perish but have everlasting life. For God did not send His Son into the world to condemn the world, but that the world through Him might be saved. He who believes in Him is not condemned; but he who does not believe is condemned already, because he has not believed in the name of the only begotten Son of God.
Jesus shed His blood to save us from death (eternal separation from God)
He paid the price for our sin (the result of disobedience of Adam & Eve in the Garden of Eden)
That is why God's salvation is free to us now (when we accept Jesus as our personal Saviour)
Ephesians 2:8, 9 for by grace you have been saved through faith, and that not of yourselves; it is the gift of God, not of works, lest anyone should boast.