What really happened on the cross:
The ten commandments are called the moral law.
We broke the law, and Jesus paid the fine, enabling God to legally set us free from sin and death.
There is therefore now no condemnation for those who are in Christ Jesus.
For the law of the Spirit of life has set you free in Christ Jesus from the law of sin and death.
For God has done what the law, weakened by the flesh, could not do. By sending his own Son in the likeness of sinful flesh and for sin, he condemned sin in the flesh,
in order that the righteous requirement of the law might be fulfilled in us, who walk not according to the flesh but according to the Spirit.
--- Romans 8:1-4
And he who believes (has faith, clings, leans on) the Son has (now possesses) eternal life. But whoever disobeys (disbelieves, refuses to trust, despises, is not submissive) to the Son will never see (experience) life, but [instead] the wrath of God remains upon him. [God's displeasure remains on him; His indignation weighs continually on him.]
--- John 3:36 amp
God is perfect; we are not.
But when He saves us and we are "born again", the Holy Spirit moves in and begins to transform our imperfections. Jesus changes us
from the inside out.
Our salvation is our personal miracle.
His blood shed on the cross covers our sin.
For God made Christ, who never sinned, to be the offering for our sin, so that we could be made right with God through Christ.(NLT)
--- 2 Corinthians 5:21 NASB
Therefore, if anyone is in Christ, he is a new creation. The old has passed away; behold, the new has come.
2 Corinthians 5:17
Jesus lives His life through us, so our chief purpose in this life is to be like Him. In our daily walk with Jesus we learn from Him and His spirit is helping us do His will over our own will.
Thus we are becoming more like Jesus. This is what it means to be conformed to His image. We become "conformed to the image of His Son"
(Romans 8:29).
God gives us eternal life as a free gift, not because we are good but because He is good and merciful.