For we hold that one is justified by faith apart from works of law.
Romans 3:28

Even if you never committed another sin after today, you could never achieve the infinite righteousness necessary to measure up to God's standard. God alone has the power to set aside our guilt and designed a mechanism by which it could be done through his own power. The infinitely perfect God had to become an infinitely perfect man and die for the sins of the rest of us in order to deflect God’s righteous judgment onto himself.