I was recently discussing original sin with some people who disagreed with it. It seemed to them something like the doctrine that 'God hates babies'. Fumbling around for what to say, I eventually settled on this.
If you buy into the 'born neutral' position, you're living in a world in which performance is everything. God's waiting with a clip-board to assess how you develop the 'blank slate' He's given you.
If you go for the 'born in sin' position, you're living in a world in which God's grace to sinners is everything. It's all about His forgiveness, not our good behaviour.
The bible says "God has bound all people over to disobedience so that He may have mercy on them all." (Romans 11:32) Original sin is actually all about the mercy of God.
Initially original sin may sound like the harsh option. Actually the 'born neutral' position is the really harsh doctrine. Especially once you become aware of your own sin.
If I've failed to convince you that 'original sin' is what the bible teaches, can I at least convince you that ongoing sin is true in your own life? And if you realize that ongoing sin is a problem for you, let me ask you which world you'd rather live in - the world of performance or the world of grace?