Well if no one had told you and many others that they were sinners then you wouldn't need these same people's "cure". Sin as far as the Christian god goes, is simply a manmade state created so someone can sell you the cure. And I know, before you say it's in the bible therefore it's true, I don't believe in the bible.
Man has laws and if a person breaks them he is called a criminal.
God has laws and if a person breaks them he is called a sinner.
Man's laws are supposed to reflect or be in harmony with God's laws.
God's laws being absolute and man's laws being relative to God's.
Death, according to Romans 6:7, is a 'cure' for sin.
(With the exception of Matt 12:32; Hebrews 6:4-6)
Death frees or acquits a person from sins due to imperfection.
That does not mean innocent, but just like a governor can pardon a criminal means the charges no longer stick. Since Jesus is the 'cure' that is what makes possible for the dead ones to have a resurrection to either heaven or right here on earth.
As far as the living, or those still alive on earth (Matt 25:31,32) when Jesus takes action to bring Peace on Earth toward men of goodwill, those sheep-like ones will not die but continue living or remain alive right into Jesus peaceful rule over earth.
Many people who do not believe in the Bible is because the clergy class does not teach what the Bible really teaches, (Mark 7:7) but they use God or do things "In His Name" to further their own agenda.