Pretty simple.
The Lord, Christ Jesus, gave Himself for the sins of humanity. He did so as a result of "grace" from God the Father, giving humanity "peace" from God.
Jesus Christ died on the cross for the sins of the world. His death atoned for all sins.
“...if anyone should be sinning, we have an Entreater with the Father, Jesus Christ, the Just. And He is the atonement for our sins, yet not ours only, but for the whole world.” (1 John 2:1-2)
Christ Jesus will deliver humanity from this present wicked age. How?
"...the Lord Himself will be descending from heaven with a shout of command, with the voice of the Chief Messenger, and with the trumpet of God, and the dead shall be rising first, then we, the living who are surviving, shall at the same time be snatched away together with them in the clouds, to meet the Lord in the air." (1 Thessalonians 4:16-18)
"Lo! a secret to you am I telling! We all, indeed, shall not be put to repose (sleep), yet we all shall be changed, in an instant, in the twinkle of an eye, at the last trump. For He will be trumpeting, and the dead will be roused incorruptible, and we shall be changed. For this corruptible must put on incorruption, and this mortal put on immortality." (1 Corinthians 15:51-53)
First we die…then we are given new immortal life at our being awakened out of sleep (made alive) - the result of FOR FREE!
“For the wages of sin is death, yet the free gift of God is eternal life, through Christ Jesus, our Lord” (Romans 6:23)
Grace and Peace from God!