The doctrine of original sin is one of the underlying beliefs in Christianity. According to this doctrine, the nature of human being is sinful due to the sin committed by Adam, and, therefore, Jesus should be sacrificed for the redemption of the whole world. Augustine discusses this issue in detail. According to him, Adam was created to have a heavenly life and had a Godly identity, but due to his disobedience, he was deprived of this endowment, descended to the earthly life, and was met with death. Adam’s sin embraced all human beings after him, and Jesus with his death paid off ransom for all humanity’s sins. Islam does not give credence to this doctrine. According to Allameh Tabataba’i, Adam was created from the scratch to have an earthly life, and his residence in paradise served as a prelude to it. Adam did not act against the commands of God because his opposition was a guided denial, and his deed is accounted for as a failure to do the better. With Adam’s repentance and God’s acceptance, the status of Adam did not change, but his location and quality of life did. This research is an endeavor to deal with the background to the original sin of Adam, the particular views of Augustine in Christianity and Allameh Tabataba’i in the world of Islam, and their underlying opinions in this regard.