Misapplied Scripture. The curse is not talking about eternity, the curses listed in the law are temporal curses here on earth, such as exile from the land if Israel did not obey the law.
17 And when he was gone forth into the way, there came one running, and kneeled to him, and asked him, Good Master, what shall I do that I may inherit eternal life?
18 And Jesus said unto him, Why callest thou me good? there is none good but one, that is, God.
19 Thou knowest the commandments, Do not commit adultery, Do not kill, Do not steal, Do not bear false witness, Defraud not, Honour thy father and mother.
Followers of Messiah/Christ do and must obey the Law of Moses.