@Guojing,
As you know, Les Feldick is a popular Hyperdispensationalist. I downloaded a collection of his writings and searched for his comments on Romans 4 and Galatians 3. He seems to concur with me time and again. He admits that Abraham was saved by faith alone. On Rom 4:5 he writes:
"The most important part of the whole Old Testament is the Abrahamic Covenant. It is the very bench mark of everything on which you and I rest by faith, and faith alone."
He basically admits that the gospel was preached even to Adam:
"In the very center of this covenant that God makes with Adam is a promise of a Redeemer....Here God says, "And I will put enmity between thee and the woman, and between thy seed and her seed; (here we pick up the seed of the woman from this who is Christ."
Feldick likes to refer to "faith alone" as "
faith + nothing". On Gal 3:7 he comments:
"We [Gentiles] have entered in the faith way + nothing the same way that Abraham did."
So where is there a different gospel? Feldick doesn't seem very clear on that point. I guess he
assumes that the Law temporarily suspended the Abrahamic Covenant of faith? But such an interruption is precisely what Paul repudiates:
"Just as no one can set aside or add to a human covenant that has been duly established, so it is in this case.
16The [covenantal] promises were spoken to Abraham and to his seed....
17What I mean is this: The law, introduced 430 years later, does not set aside the [Abrahamic] covenant previously established by God and thus do away with the [Abrahamic] promise."
If Feldick is trying to establish discontinuity, he seems to be doing a poor job of it.