In the Christian doctrine, sin is considered to be disobedience to God's laws and commands, leading to separation from Him. However, those who believe in Jesus Christ and accept Him as their Lord and Savior are said to be under grace. Grace refers to God's unmerited favor and love towards humanity, which allows believers to receive forgiveness of sins and eternal life. Therefore, sin has no dominion or power over those who are under grace, as they have been set free from its control and condemnation by the sacrifice of Jesus Christ on the cross. This is based on the teachings of the apostle Paul in the New Testament book of Romans.