We don't forsake the law because our salvation is by faith in Jesus. But in fact, only when we have faith do we truly fulfill the law.
There is no way to follow the law perfectly, by human standards and strength alone. The one and only way to fulfill it in all it's fullness is to believe in Christ first, then only are we able to do what is required by God.
That is what the law was originally for.
It was what God wanted for us.
Is what God wants.
That's why we have the law.
It's not for us to achieve a communion or to reach God's standards or access to Him or something arbitrary like that...
What's the reason we have the law?
It's because that is what God wants.
But by our human standards we will never ever achieve it.
