It is the law that shows us our sin. Romans 3:20: “because by the works of the Law no flesh will be justified in His sight; for through the Law comes the knowledge of sin.”
Most of the people I talk to don’t know that they are sinners, or that they can’t get to heaven by trying to be good.
Ask them if they think they’re perfect. Almost all people I have talked to know they ain’t. They already know what that means with respect to God. What they do not know is that Jesus is God Himself.