If you believe in a soft God where all we have to do is know he loves us, and everything will work out just fine, then you need to read this article.
The Bible declares that God “has set a day in which he purposes to judge the inhabited earth.” (Acts 17:31)
This day of judgment, also known as the Final Judgment, is when Jesus, the Son of God, will judge "the living and the dead" before destroying the old heaven and earth, which are corrupted of sin.
Sin can be defined as anything that opposes God’s will and law. To engage in sin is to disobey or abuse His laws. Because the urge to sin resides in human nature, mankind is corrupted and somewhat driven by the immoral inclinations that live in all people. This is a consequence of the fall into sin in the garden of Eden. Before creating His new heaven and earth, God must do away with anything that could produce or bear sin into His new creation.
Jesus Christ will act as the justice of the last judgment, as the Bible states "Moreover, the Father judges no one, but has entrusted all judgment to the Son," (John 5:22). All skeptics will be judged by Christ at the “great white throne,” and they will face punishment in accordance with the acts they have done. The Bible is very definite that skeptics are collecting up vengeance against themselves and that God will “give to each person according to what he has done” (Romans 2:5-6). At the final judgment, the destiny of the wicked and nonbelievers will be in the control of the almighty God who will assess everyone according to their soul’s status.
Bible verses about God's judgment
1 Peter 4:17
For it is time for judgment to begin at the household of God; and if it begins with us, what will be the outcome for those who do not obey the gospel of God?
For we must all appear before the judgment seat of Christ, so that each one may receive what is due for what he has done in the body, whether good or evil.
Then I saw a great white throne and him who was seated on it. From his presence earth and sky fled away, and no place was found for them. And I saw the dead, great and small, standing before the throne, and books were opened. Then another book was opened, which is the book of life. And the dead were judged by what was written in the books, according to what they had done. And the sea gave up the dead who were in it, Death and Hades gave up the dead who were in them, and they were judged, each one of them, according to what they had done. Then Death and Hades were thrown into the lake of fire. This is the second death, the lake of fire. And if anyone's name was not found written in the book of life, he was thrown into the lake of fire.
And just as it is appointed for man to die once, and after that comes judgment,
The Father judges no one, but has given all judgment to the Son,
I tell you, on the day of judgment people will give account for every careless word they speak,
For the wages of sin is death, but the free gift of God is eternal life in Christ Jesus our Lord.
And there's a lot more. Read them here.