Galatians 1:6–7 (ESV)
6 I am astonished that you are so quickly deserting him who called you in the grace of Christ and are turning to a different gospel—
7 not that there is another one, but there are some who trouble you and want to distort the gospel of Christ. (Emphasis Added)
We are called in the grace of Christ.
Paul refers to the grace of Christ as the gospel of Christ.
Acts 20:24 (ESV)
24 But I do not account my life of any value nor as precious to myself, if only I may finish my course and the ministry that I received from the Lord Jesus, to testify to the gospel of the grace of God. (Emphasis Added)
The gospel and grace are used interchangeably in scripture. The gospel of Christ is the grace of God. And the gospel of grace is this: Jesus offered one sacrifice for sins forever; he died on the cross and took your sins past, present, and future. The gospel of grace is over the top good news that your sins have been done away with on the cross.
Grace is God's unmerited, unearned, and undeserved favor.
Adam was the federal head of the human race and he committed the sin of high treason in the garden. And he brought sin into the world and every man born after him inherited his sin nature. So, God had to judge sin. That is why Jesus is called our Savior because He died on the cross to take away our sins. He took our place on the cross. Sin had to be judged so Jesus went to the cross and took our place. The condemnation went on Him for our sins.
Hebrews 10:10–14 (ESV)
10 And by that will we have been sanctified through the offering of the body of Jesus Christ once for all.
11 And every priest stands daily at his service, offering repeatedly the same sacrifices, which can never take away sins.
12 But when Christ had offered for all time a single sacrifice for sins, he sat down at the right hand of God,
13 waiting from that time until his enemies should be made a footstool for his feet.
14 For by a single offering he has perfected for all time those who are being sanctified. (Emphasis Added)
On the cross, Jesus offered for all time a single sacrifice for sins. His work on the cross was good for all time. That means your past, present, and future sins have already been forgiven. God judged Jesus for the sins of the whole world forever. Sin is no longer an issue. God is not judging the unbelievers for their sins. Sin has already been judged. People do not go to hell because of sin, but rather because of rejecting Jesus who is the solution to the sin problem. Even after you are saved, sin is no longer an issue. After we are born again, God does not judge the believer for his sins.
God is not punishing you for your sins. He is not mad at you when you make a mistake. He already punished Jesus for all the sins that you will ever commit. They have already been judged. Beware of the devil who will try to condemn you because you do something wrong. He tries to bring people under condemnation because they make a mistake and tells them that God will not answer their prayers because they did not pray today, or because they have not been to church for two weeks, or they did not read their Bible all week. That is the law, and we are not under the law. That is performance-based living and God does not relate to us anymore based on our performance. He does not bless us or answer our prayers because of what we do, but because of what Jesus did for us on the cross. God loves you as much as He loves Jesus (John 17:23), and when He sees you, He sees His Son, Jesus. As Jesus is, so are we in this world (1 John 4:17). We are in Christ Jesus and God sees us in Him.