God (because of His love) has not abandoned sinners
A person, (human soul) is rescued from the present and eternal consequences of sin, only through God’s undeserved mercy and kindness (grace) because of the life, sufferings, death and resurrection of Christ – through faith. The New Testament Scripture of Ephesians 2:1-10 is a summary, of what “this” is, and how this “exchange” takes place.
Also: Please note:
Another explanation -- “Justification by Faith:”
Justification by grace, for Christ’s sake, through faith, is the living heart of Christianity, the central teaching which distinguishes the Christian religion from all false religions, and the one source of solid comfort for us sinners.
Only Christianity has a doctrine called the forgiveness of sins. Listen to an expert on this matter.
[Above, "Justification by Faith," taken from: “That I May Know Him” – "A Book of Instruction in the Christian Faith" – Page 67 -- by Oswald Riess, Detroit, MI – 1970 / Reprint, 2005]