The purpose of this thread is to compare and contrast these two approaches concerning the first sin, and how that sin affects...well all of us. I couldn't find much on the web about ancestral sin, except in some contrast posts by Orthodox Christians, who didn't really present original sin correct to start off with. So below I will give a definition from the Compendium of the CCC which is the shortest most concise official definition I could find. I hope that an Orthodox Christian will provide a definition of the doctrine of Ancestral sin, so that we can discuss these two supposedly opposing doctrines.
76. What is original sin?
404
419
Original sin, in which all human beings are born, is the state of deprivation of original holiness and justice. It is a sin “contracted” by us not “committed”; it is a state of birth and not a personal act. Because of the original unity of all human beings, it is transmitted to the descendants of Adam “not by imitation, but by propagation”. This transmission remains a mystery which we cannot fully understand.
77. What other consequences derive from original sin?
405-409
418
In consequence of original sin human nature, without being totally corrupted, is wounded in its natural powers. It is subject to ignorance, to suffering, and to the dominion of death and is inclined toward sin. This inclination is called concupiscence.
76. What is original sin?
404
419
Original sin, in which all human beings are born, is the state of deprivation of original holiness and justice. It is a sin “contracted” by us not “committed”; it is a state of birth and not a personal act. Because of the original unity of all human beings, it is transmitted to the descendants of Adam “not by imitation, but by propagation”. This transmission remains a mystery which we cannot fully understand.
77. What other consequences derive from original sin?
405-409
418
In consequence of original sin human nature, without being totally corrupted, is wounded in its natural powers. It is subject to ignorance, to suffering, and to the dominion of death and is inclined toward sin. This inclination is called concupiscence.