For those interested in Works-based salvation, you have to keep in mind that you must follow THE WHOLE law for this to have any effect. That means not eating pork, animal sacrifices, the whole 9 yards.
Gal 5:2 Behold, I Paul say unto you, that if ye be circumcised, Christ shall profit you nothing.
3 For I testify again to every man that is circumcised, that he is a debtor to do the whole law.
For you women, that means staying in a hotel for one week out of each month. For you men, no bar-b-q'ing on Sunday (or Saturday night), or cooking of any kind. You prepared to do that? If not, you will lose your salvation (in a works-based system).
But see what Paul says:
Gal 4:21 Tell me, ye that desire to be under the law, do ye not hear the law?
22 For it is written, that Abraham had two sons, the one by a bondmaid, the other by a freewoman.
23 But he [who was] of the bondwoman was born after the flesh; but he of the freewoman [was] by promise.
24 Which things are an allegory: for these are the two covenants; the one from the mount Sinai, which gendereth to bondage, which is Agar.
25 For this Agar is mount Sinai in Arabia, and answereth to Jerusalem which now is, and is in bondage with her children.
26 But Jerusalem which is above is free, which is the mother of us all.
27 For it is written, Rejoice, [thou] barren that bearest not; break forth and cry, thou that travailest not: for the desolate hath many more children than she which hath an husband.
28 Now we, brethren, as Isaac was, are the children of promise.
29 But as then he that was born after the flesh persecuted him [that was born] after the Spirit, even so [it is] now.
30 Nevertheless what saith the scripture? Cast out the bondwoman and her son: for the son of the bondwoman shall not be heir with the son of the freewoman.
31 So then, brethren, we are not children of the bondwoman, but of the free.
Paul says that - According to The Law itself, salvation is by Faith. Furthermore, consider what I believe to be the first Christian - Abraham.
Gen 15:5 And he brought him forth abroad, and said, Look now toward heaven, and tell the stars, if thou be able to number them: and he said unto him, So shall thy seed be.
6 And he believed in the LORD; and he counted it to him for righteousness.
Paul sees Abraham's salvation, and offers this observation:
Gal 3:6 Even as Abraham believed God, and it was accounted to him for righteousness.
7 Know ye therefore that they which are of faith, the same are the children of Abraham.
8 And the scripture, foreseeing that God would justify the heathen through faith, preached before the gospel unto Abraham, [saying], In thee shall all nations be blessed.
9 So then they which be of faith are blessed with faithful Abraham.
God preached the Gospel (before it even existed) to Abraham, and he believed God and THIS is what was counted for righteousness. Paul makes this argument in Galatians, and also in Romans:
Rom 4:2 For if Abraham were justified by works, he hath [whereof] to glory; but not before God.
3 For what saith the scripture? Abraham believed God, and it was counted unto him for righteousness.
5 But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness.
Paul goes on to LEGALLY PROVE from The Law (the Torah) that Abraham was justified by faith:
Rom 4:9 [Cometh] this blessedness then upon the circumcision [only], or upon the uncircumcision also? for we say that faith was reckoned to Abraham for righteousness.
10 How was it then reckoned? when he was in circumcision, or in uncircumcision? Not in circumcision, but in uncircumcision.
11 And he received the sign of circumcision, a seal of the righteousness of the faith which [he had yet] being uncircumcised: that he might be the father of all them that believe, though they be not circumcised; that righteousness might be imputed unto them also:
12 And the father of circumcision to them who are not of the circumcision only, but who also walk in the steps of that faith of our father Abraham, which [he had] being [yet] uncircumcised.
Paul says "hey Abraham was considered righteous IN THE LAW (the Torah) by his faith - having been told of Jesus Christ (Gal 3:16, Gen 15:5-6) and believing in Christ even before he fulfilled the WORKS of the covenant by being circumcised. It wasn't until AFTER he had been counted righteous by God that Abraham was circumcised.