Because it serves no purpose to the believer, and again was never given to us gentiles. Just mocking Christ and all His good works, because you cant keep the law, it was the whole reason why Christ died for us, and teh lawAnd what is the motivation of those who falsely accuse others of using the law and their obedience to it as a means to salvation. Please share that with is.
Rom_3:20 Therefore by the deeds of the law there shall no flesh be justified in his sight: for by the law is the knowledge of sin.
it will just keep reminding you of the sinner you are, Jesus never died so you could "try": keep something you cant, He died so you wouldnt be condemned for your sins, but keeping yourself under the law that was never yours, just keeps you in condemnation,, if that is what you really want.