Why is understanding original sin important for Christians?

Original sin refers to the theology that Adam's first transgression has implications for all humanity, leading to a fallen state that affects our nature and ability to do good. This doctrine is essential in understanding the biblical teaching about sin and its consequences, as articulated in Romans 5:12, which explains that sin entered the world through one man, and death spread to all because all sinned. Recognizing our original sin reminds us of our total depravity and the necessity of God's grace for salvation. Without understanding original sin, the richness of the grace offered in Christ and the significance of His sacrificial atonement cannot be fully appreciated, making it a foundational doctrine in Christian theology.