Even the Murderer, Rapist, and Pedophile!?

But now the righteousness of God has been manifested apart from the law, although the Law and the Prophets bear witness to it— the righteousness of God through faith in Jesus Christ for all who believe. For there is no distinction: for all have sinned and fall short of the glory of God, and are justified by his grace as a gift, through the redemption that is in Christ Jesus, whom God put forward as a propitiation by his blood, to be received by faith. This was to show God’s righteousness, because in his divine forbearance he had passed over former sins. It was to show his righteousness at the present time, so that he might be just and the justifier of the one who has faith in Jesus.
~Romans 3:21-26

Sin is handled in one of two ways.

For those in Christ, their sin was dealt with at the Cross. It was answered for in Christ who drank to the brine the cup of the God's Wrath in our place. Our sin was answered for in the blood of Jesus Christ. Christ was the propitiation reconciling those who believe with God.

For those outside of Christ, they shall be brought low before God with the debt of their sin upon them, and they will be eternally undone in God's Wrath. They will be unable to stand before God, for even their greatest deeds and greatest acts of righteousness will be before God as filthy and stained garments.

The chiefest sinner among us, guilty of the most atrociously inhuman acts, may through faith and repentance in Christ, find forgiveness and a friend in God. Upon Christ was laid the sins of the world that those who believe in Christ, -that is trusting in Him, abiding in Him, following after Him- may be reconciled to God.

But you might say: What about the murderer!? What about the rapist!? What about the pedophile!?

Even him. For if it cannot work for them, how can it work for us? If God cannot forgive them through the work of Christ whom He raised from the dead, how can we rest assured that He will forgive any of us? Either God is true when He says to those who believe:

And you, who were dead in your trespasses and the uncircumcision of your flesh, God made alive together with [Christ], having forgiven us all our trespasses, by canceling the record of debt that stood against us with its legal demands. This he set aside, nailing it to the cross. He disarmed the rulers and authorities and put them to open shame, by triumphing over them in [Christ]. (Colossians 2:13-15, emphasis added)

Or He is not and completely untrustworthy.

Jesus said:

"...All that the Father gives me will come to me, and whoever comes to me I will never cast out. For I have come down from heaven, not to do my own will but the will of him who sent me. And this is the will of him who sent me, that I should lose nothing of all that he has given me, but raise it up on the last day. For this is the will of my Father, that everyone who looks on the Son and believes in him should have eternal life, and I will raise him up on the last day." (John 6:37-40, emphasis added)

Everyone who looks upon Christ and believes, it is written, shall be rescued from wrath and reconciled to God. The death, burial, and resurrection of Jesus Christ was sufficient for all sinners, and all are called to look upon the Son and believe. It is not solely those with acceptable sins that are called to repentance and faith, but all men are commanded to repent and believe.

Those in Christ are blessed because He was cursed for our sake. He took on our sin and shame and bled and died that we might be reconciled through grace by faith in Him. He bore our transgressions and by His stripes we are healed, yes even the murderer and the rapist.

There exists no sin so great that God cannot pass over in the work of Christ on the Cross. No transgression have you committed that would keep God from fulfilling His promise to you who believe.

But for those who reject the Gospel of Christ, and reject the message of reconciliation; those who are convinced to stand before God by their own merit; there exists no sin so minor that God, the Righteous Judge, can ever rightly turn a blind eye to. For the wages of sin, all sin, is death.