@deegee- I don't agree with your interpretation.
There's no official position from Catholic Church about why Jesus was killed. It's a complete mystery.
As a human he was doomed to die. The original sin needed to be paid with his death. But maybe could be a natural death. There's about 4 views in CC about the crucifixion of Christ.
The text you mentioned is about original sin (the "generator" of all sins). Baptism removes the guilty of this sin because the death of Christ. But it doesn't removes the consequences. Actually all consequences of your sins need to be paid by you (here or in purgatory or both). This payment is through suffering under special conditions. The Catholic faith gives meaning to our inevitable suffering, no other system gives that AFAIK (the meaning to suffering was a goal to Nietzsche).
The removing of sin is about the guilty of sin (which is perdition, second death) but not the consequences of sin (suffering).
Basically you are confused about guilty and consequences of sin.