Galatians 3

10 For all who rely on the works of the law are under a curse, as it is written: “Cursed is everyone who does not continue to do everything written in the Book of the Law.”
The purpose of the law wasn’t to save us but to reveal the nature and will of God, shows us how to live. However because of our shortcomings, no good deed can make us right before God. The belief that salvation is earned rather than given is legalism which has no scriptural basis. It's only by embracing his son everyday can save us from what we deserve.