God is the holy, just, and gracious Creator of all things, including us. He has the right to tell us how to live. To reject and rebel against God's authority is to sin against Him. God will not ignore sin and leave the guilty unpunished.

In the beginning, God created the heavens and the earth. - Genesis 1:1 ESV

"Worthy are you, our Lord and God, to receive glory and honor and power, for you created all things, and by your will they existed and were created." - Revelation 4:11 ESV

For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who by their unrighteousness suppress the truth. For what can be known about God is plain to them, because God has shown it to them. For his invisible attributes, namely, his eternal power and divine nature, have been clearly perceived, ever since the creation of the world, in the things that have been made. So they are without excuse. - Romans 1:18-20 ESV

For all who have sinned without the law will also perish without the law, and all who have sinned under the law will be judged by the law. For it is not the hearers of the law who are righteous before God, but the doers of the law who will be justified. For when Gentiles, who do not have the law, by nature do what the law requires, they are a law to themselves, even though they do not have the law. They show that the work of the law is written on their hearts, while their conscience also bears witness, and their conflicting thoughts accuse or even excuse them on that day when, according to my gospel, God judges the secrets of men by Christ Jesus. - Romans 2:12-16 ESV

This is the message we have heard from him and proclaim to you, that God is light, and in him is no darkness at all. If we say we have fellowship with him while we walk in darkness, we lie and do not practice the truth. But if we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus his Son cleanses us from all sin. - 1 John 1:5-7 ESV

Because the first man and woman rejected God, sin has corrupted every part of human existence. Our entire being is under sin's power. The penalty for sin is both physical and spiritual death. Our final destiny is eternal, active judgment in hell.

Now the serpent was more crafty than any other beast of the field that the LORD God had made. He said to the woman, "Did God actually say, 'You shall not eat of any tree in the garden'?" And the woman said to the serpent, "We may eat of the fruit of the trees in the garden, but God said, 'You shall not eat of the fruit of the tree that is in the midst of the garden, neither shall you touch it, lest you die.'" But the serpent said to the woman, "You will not surely die. For God knows that when you eat of it your eyes will be opened, and you will be like God, knowing good and evil." So when the woman saw that the tree was good for food, and that it was a delight to the eyes, and that the tree was to be desired to make one wise, she took of its fruit and ate, and she also gave some to her husband who was with her, and he ate. - Genesis 3:1-6 ESV

Behold, I was brought forth in iniquity, and in sin did my mother conceive me. - Psalm 51:5 ESV

For although they knew God, they did not honor him as God or give thanks to him, but they became futile in their thinking, and their foolish hearts were darkened. Claiming to be wise, they became fools, and exchanged the glory of the immortal God for images resembling mortal man and birds and animals and creeping things. Therefore God gave them up in the lusts of their hearts to impurity, to the dishonoring of their bodies among themselves, because they exchanged the truth about God for a lie and worshiped and served the creature rather than the Creator, who is blessed forever! Amen. - Romans 1:21-25 ESV

What then? Are we Jews any better off? No, not at all. For we have already charged that all, both Jews and Greeks, are under sin, as it is written: "None is righteous, no, not one; no one understands; no one seeks for God. All have turned aside; together they have become worthless; no one does good, not even one." "Their throat is an open grave; they use their tongues to deceive." "The venom of asps is under their lips." "Their mouth is full of curses and bitterness." "Their feet are swift to shed blood; in their paths are ruin and misery, and the way of peace they have not known." "There is no fear of God before their eyes." - Romans 3:9-18 ESV

For the wages of sin is death, but the free gift of God is eternal life in Christ Jesus our Lord. - Romans 6:23 ESV

And you were dead in the trespasses and sins in which you once walked, following the course of this world, following the prince of the power of the air, the spirit that is now at work in the sons of disobedience—among whom we all once lived in the passions of our flesh, carrying out the desires of the body and the mind, and were by nature children of wrath, like the rest of mankind. - Ephesians 2:1-3 ESV

Christ Jesus is fully God and fully man. He lived a sinless life and died sacrificially on the cross in the place of His people, paying sin's penalty on their behalf. He rose from the dead, assuring us that His propitiatory sacrifice was acceptable to God. Jesus Christ alone can free us from the penalty and power of sin and reconcile us to God through His death and resurrection. He alone satisfies the wrath of God in the place of sinners who put their faith in His finished work. 

In the beginning was the Word, and the Word was with God, and the Word was God. - John 1:1 ESV

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 ESV

For while we were still weak, at the right time Christ died for the ungodly. For one will scarcely die for a righteous person—though perhaps for a good person one would dare even to die—but God shows his love for us in that while we were still sinners, Christ died for us. Since, therefore, we have now been justified by his blood, much more shall we be saved by him from the wrath of God. For if while we were enemies we were reconciled to God by the death of his Son, much more, now that we are reconciled, shall we be saved by his life. - Romans 5:6-10 ESV

For if, because of one man's trespass, death reigned through that one man, much more will those who receive the abundance of grace and the free gift of righteousness reign in life through the one man Jesus Christ. Therefore, as one trespass led to condemnation for all men, so one act of righteousness leads to justification and life for all men. For as by the one man's disobedience the many were made sinners, so by the one man's obedience the many will be made righteous. - Romans 5:17-19 ESV

There is therefore now no condemnation for those who are in Christ Jesus. For the law of the Spirit of life has set you free in Christ Jesus from the law of sin and death. For God has done what the law, weakened by the flesh, could not do. By sending his own Son in the likeness of sinful flesh and for sin, he condemned sin in the flesh, in order that the righteous requirement of the law might be fulfilled in us, who walk not according to the flesh but according to the Spirit. - Romans 8:1-4 ESV

For as by a man came death, by a man has come also the resurrection of the dead. For as in Adam all die, so also in Christ shall all be made alive. - 1 Corinthians 15:21-22 ESV

For our sake he made him to be sin who knew no sin, so that in him we might become the righteousness of God. - 2 Corinthians 5:21 ESV

For there is one God, and there is one mediator between God and men, the man Christ Jesus, who gave himself as a ransom for all... - 1 Timothy 2:5-6 ESV

There is nothing we can do to become right with God. We are reconciled to God only through faith in Jesus and all that He has done on our behalf. When we repent and believe on Jesus, all of our sin is placed upon Christ, and the perfect life Jesus lived is credited to us. After responding to the gospel through faith and repentance, Christians are baptized publicly as an outward expression of the inward transformation that God has begun in them. 

Now after John was arrested, Jesus came into Galilee, proclaiming the gospel of God, and saying, "The time is fulfilled, and the kingdom of God is at hand; repent and believe in the gospel." - Mark 1:14-15 ESV

Now when they heard this they were cut to the heart, and said to Peter and the rest of the apostles, "Brothers, what shall we do?" And Peter said to them, "Repent and be baptized every one of you in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit. For the promise is for you and for your children and for all who are far off, everyone whom the Lord our God calls to himself." - Acts 2:37-39 ESV

For I am not ashamed of the gospel, for it is the power of God for salvation to everyone who believes, to the Jew first and also to the Greek. For in it the righteousness of God is revealed from faith for faith, as it is written, "The righteous shall live by faith." - Romans 1:16-17 ESV

So you also must consider yourselves dead to sin and alive to God in Christ Jesus. Let not sin therefore reign in your mortal body, to make you obey its passions. Do not present your members to sin as instruments for unrighteousness, but present yourselves to God as those who have been brought from death to life, and your members to God as instruments for righteousness. For sin will have no dominion over you, since you are not under law but under grace. - Romans 6:11-14 ESV

But if Christ is in you, although the body is dead because of sin, the Spirit is life because of righteousness. If the Spirit of him who raised Jesus from the dead dwells in you, he who raised Christ Jesus from the dead will also give life to your mortal bodies through his Spirit who dwells in you. - Romans 8:1-11 ESV

Because, if you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved. For with the heart one believes and is justified, and with the mouth one confesses and is saved. For the Scripture says, "Everyone who believes in him will not be put to shame." For there is no distinction between Jew and Greek; for the same Lord is Lord of all, bestowing his riches on all who call on him. For "everyone who calls on the name of the Lord will be saved." - Romans 10:9-13 ESV