God is Just
and cannot overlook sin
Another picture of this same scene found in Revelation 21:8 sheds light on the subject.
But as for the cowardly, the faithless, the detestable, as for murderers, the sexually immoral, sorcerers, idolaters, and all liars, their portion will be in the lake that burns with fire and sulfur, which is the second death.
But the fearful, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death.”
God's just nature demands that He hold us accountable for the specific sins that we have committed. How many murders does a man have to commit before he becomes a murderer? Only one. How many lies does a person have to tell before he becomes a liar? Only one, and we have all lied at least once. The Bible tells us that all liars will be condemned to this lake of fire.
You may be saying, “How could a loving God do this?” Imagine a judge presiding over a murder trial. Would justice be served if that judge chose to overlook the obvious guilt of the defendant and acquit a murderer? No!
God is both loving and just
God's justice doesn't cause Him to ignore our problem
God's love doesn't cause Him to overlook our sin
Imagine a judge ...
Now suppose the guilty man was the judge's brother and he loved him. Would it be just if the judge chose to overlook his guilt and acquit him? No! Love does not undo the necessity for justice. God is loving, but because of His nature He is bound by justice. He must judge our sin. But God's love will not allow Him to ignore our doom.