The Gospel Of Salvation

Hebrews 10:19

19 Therefore, brothers and sisters, since we have confidence to enter the Most Holy Place by the blood of Jesus

The gospel is simple yet many want to complicate it, the bible says that we simply trust what Christ did for us and we are saved in that instant, being eternally secure "And I give unto them eternal life; and they shall never perish, neither shall any man pluck them out of my hand." (John 10:28)

We are sinful who deserve hell, the bible declares: "For all have sinned, and come short of the glory of God;" (Romans 3:23), we can never earn salvation by our own works as we are all condemned before God, if we were to stand on our own merits we would go to hell, as all our works are worthless "dirty rags" (Isaiah 64:6)
However, there is good news, God himself came to the earth to save us. Jesus Christ the Lord is God incarnate Who came to earth to save us from our sins, born of a virgin He lived a perfect life without any sin and died on the cross for our sins, shedding His blood for us. Christ is the sacrifice on our behalf, taking the punishment of our sins upon himself:

Hebrews 9:

22 And almost all things are by the law purged with blood; and without shedding of blood is no remission.

23 It was therefore necessary that the patterns of things in the heavens should be purified with these; but the heavenly things themselves with better sacrifices than these.

24 For Christ is not entered into the holy places made with hands, which are the figures of the true; but into heaven itself, now to appear in the presence of God for us:

25 Nor yet that he should offer himself often, as the high priest entereth into the holy place every year with blood of others;

26 For then must he often have suffered since the foundation of the world: but now once in the end of the world hath he appeared to put away sin by the sacrifice of himself.

The Bible states the gospel in 1 Corinthians 15:1-4:

1 Corinthians 15:1-4

15 Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand;

2 By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain.

3 For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures;

4 And that he was buried, and that he rose again the third day according to the scriptures:

What about after we are saved?

After we have been justified, God sees us as His sons, we may be disciplined "Hebrews 12:6: For whom the Lord loveth he chasteneth, and scourgeth every son whom he receiveth.", lose rewards (1 Corinthians 3), suffer the natural consequences of sin and lack close intimacy with God, yet we cannot lose salvation.