Here’s the reason: Whoever sins without having the laws in Moses’ Teachings will still be condemned to destruction. And whoever has these laws from God and sins will still be judged by them.
Jesus answered Pilate, “You wouldn’t have any authority over me if it hadn’t been given to you from above. That’s why the man who handed me over to you is guilty of a greater sin.”
It is impossible to do what God’s standards demand because of the weakness our human nature has. But God sent his Son to have a human nature as sinners have and to pay for sin. That way God condemned sin in our corrupt nature.
I became like a person who does not have Moses’ Teachings for those who don’t have those teachings. I did this to win them even though I have God’s teachings. I’m really subject to Christ’s teachings.
Certainly, there is a curse on all who rely on their own efforts because Scripture says, “Whoever doesn’t obey everything that is written in Moses’ Teachings is cursed.”
But Scripture states that the whole world is controlled by the power of sin. Therefore, a promise based on faith in Jesus Christ could be given to those who believe.