How do you find that original sin is atoned for?
Ben,
Great question. I think Romans 5:12-21 answers it.
Those who remain in the first Adam, remain in the realm of sin and death, and their sin is not atoned for- They go to the White throne judgment.
Rom.5:12 Wherefore, as
by one man sin entered into the world, and death by sin; and so death passed upon all men,
for that all have sinned:
[First birth= Spiritually dead]
Sinners who become born again/ from above , their sin was paid 100% by Jesus in His Covenant death that He accomplished.
Rom. 5:15 But not as the offence, so also is the free gift.
For if through the offence of one many be dead, much more the grace of God, and the gift by grace, which is by one man, Jesus Christ,
hath abounded unto many.
Does this help a little ?