Chuckle!!! "Atonement" has ALWAYS BEEN LIMITED. When a person DOESN'T repent under conviction of sin, and cry out in (gifted) FAITH for salvation, they limit the atonement. Simple as that."Behold the Lamb of God who takes away the sin of the world".
A certain poster claims your sins are forgiven or taken away when you believe. Not all will believe so it seems not all sin is taken away or forgiven.
So much for unlimited atonement.