Why is the concept of free will important in Christianity?

In the realm of theology, particularly within sovereign grace, the concept of free will is often misunderstood. Scripture consistently affirms that salvation is not dependent on human will or decision-making, as seen in Romans 9:16, which states, 'So then it is not of him that willeth, nor of him that runneth, but of God that showeth mercy.' This indicates that if salvation relied on human free will, it would ultimately fail because of mankind's fallen nature. Thus, understanding the limitations of free will in the context of salvation rightly contextualizes God's grace, reminding believers that it is God who draws, calls, and effects salvation—only He can change a sinner's heart and give the gift of faith.