Summary: God is righteous. You are not. (Your conscience bears witness.) Your death is inevitable. And you cannot escape the judgment of God: And whosoever was not found written in the book of life was cast into the lake of fire. Hence the warning: you need your sins forgiven.
Read it in the King James Bible, the epistle to the Romans, chapter 1 verse 18 through chapter 4.
The wrath of God is revealed
'For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who hold the truth in unrighteousness'
And 'The soul that sinneth, it shall die.'
This means you.
And whosoever was not found written in the book of life was cast into the lake of fire.
Escape? No way
'It is a fearful thing to fall into the hands of the living God.'