Final answer:
Augustine of Hippo deeply engaged with the question of human sin's origin, positing that despite the original sin, humans can choose the good, a choice enabled by God's grace.
Step-by-step explanation:
The church father who was most concerned with the origin of human sin was Augustine of Hippo. Augustine wrestled with the concept of free will and its alignment with God's omniscience. He believed that despite the original sin of Adam and Eve, humans have the capacity to choose goodness, but this is ultimately made possible through divine grace.
Augustine vehemently opposed heresies such as Pelagianism, which claimed that human beings could achieve salvation without God's help, and Manicheanism, which depicted a universe caught in a battle between equally powerful forces of good and evil. Instead, Augustine asserted that everything created by God was inherently good and that any perceived evil was part of God's greater plan.