1 John 2:
2 And he is the propitiation for our sins: and not for ours only, but also for the sins of the whole world.
Notice John says Christ is the Propitiation that is satisfaction for our sin. Not for ours only but for the whole world.
2 Corinthians 5:
18 And all things are of God, who hath reconciled us to himself by Jesus Christ, and hath given to us the ministry of reconciliation;
19 To wit, that God was in Christ, reconciling the world unto himself, not imputing their trespasses unto them; and hath committed unto us the word of reconciliation.
20 Now then we are ambassadors for Christ, as though God did beseech you by us: we pray you in Christ's stead, be ye reconciled to God.
Then Paul states God is not imputing the trespass of the world, but reconciling the world unto Himself.
Therefore what sends a person to the Lake of Fire?
The Propitiation of appeasement of God for all mankind has occurred by the blood of Christ. Their trespasses are not imputed that is counted against them so what causes them to end up in the Lake of Fire?
John3:
17 For God sent not his Son into the world to condemn the world; but that the world through him might be saved.
18 He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God.
Jesus said it is unbelief.
The Revelation of Jesus Christ chapter 20 again
14 And death and hell were cast into the lake of fire. This is the second death.
15 And whosoever was not found written in the book of life was cast into the lake of fire.
Those not written in the book of life. We see this book in two other places in Revelation.
Revelation 13:
7 And it was given unto him to make war with the saints, and to overcome them: and power was given him over all kindreds, and tongues, and nations.
8 And all that dwell upon the earth shall worship him, whose names are not written in the book of life of the Lamb slain from the foundation of the world.
9 If any man have an ear, let him hear.
Then those who will be in the New Jerusalem are seen in
Revelation 21:
26 And they shall bring the glory and honour of the nations into it.
27 And there shall in no wise enter into it any thing that defileth, neither whatsoever worketh abomination, or maketh a lie: but they which are written in the Lamb's book of life.
So how does one have their name entered into the Lamb's book of Life?
By Faith in the savior which is accepting His Propitiatory payment for them, to reject is to be separated from God forever that is the Second Death.