Even if I accepted your use of the masculine, feminine, neuter, relationship between gift and grace and faith: You have not shown how faith engendered by man, even in your construction of "through Abraham" or "in Abraham", is possible to be effective faith, or real, but by the Spirit of God within. "Apart from ME (Christ) you can do nothing" is not hyperbole.
Now there you go with a purely Arminian description. "All you have to do..." implies that God can't do this on his own. It leaves you along-side those who have said, that in the end, "it is 100% up to you".
There is no example in scripture where mere belief was insufficient to qualify a person for justification. Further, we have a myriad of examples where mere belief without the indwelling of the Holy Spirit or regeneration or circumcision of the heart was enough to qualify a person (the chief of which is Abraham). Hebrews 11 has a number of examples from the Old Testament from before the Holy Spirit was given to indwell man. Without Jesus coming to earth, living a sinless life, and dying (physically & spiritually) to atone for sin, there would be no righteousness available to give to Abraham in response to his unregenerate faith. Therefore, "apart from me you can do nothing" is absolutely sustained and true within a synergistic model. The Abrahamic covenant, then, is a distribution method for dispersing Christ's righteousness to those with the same unregenerate faith in the gospel as Abraham who qualify as his descendants and thereby stand to inherit Christ's righteousness which was given to Abraham and promised to his
descendants - those with the same unregenerate faith as Abraham.
This is where both Calvin and Arminius got it wrong. They both viewed faith as the qualification for righteousness itself, rather than as a qualification for a promised inheritance. It was GRACE to promise righteousness to Abraham's descendants (Rom 4:16) -- they didn't deserve it because they were so good. They didn't earn it by being righteous according to the law (for the law didn't exist when the promise was made). They didn't earn the inheritance, but they obtained an inheritance by the graceful choice of God to choose Abraham and promise it, without regard to individuals, to his descendants. God didn't have to make this promise... it was His graceful choice to make that promise, and God cannot lie. Without the promise, Abraham's descendants would be just as 'lost' and dead in their sin as anyone else (regardless of faith). Because of the promise, any descendant of Abraham can inherit the promise.
[Neh 9:7-8 NASB95] 7 "You are the LORD God, Who chose Abram And brought him out from Ur of the Chaldees, And gave him the name Abraham. 8 "You found his heart faithful before You, And made a covenant with him To give [him] the land of the Canaanite, Of the Hittite and the Amorite, Of the Perizzite, the Jebusite and the Girgashite To give [it] to his descendants. And You have fulfilled Your promise, For You are righteous.
[Deu 7:6-8 NASB95] 6 "For you are a holy people to the LORD your God; the LORD your God has chosen you to be a people for His own possession out of all the peoples who are on the face of the earth. 7 "The LORD did not set His love on you nor choose you because you were more in number than any of the peoples, for you were the fewest of all peoples, 8 but because the LORD loved you and kept the oath which He swore to your forefathers, the LORD brought you out by a mighty hand and redeemed you from the house of slavery, from the hand of Pharaoh king of Egypt.
God '
found' Abraham's heart faithful, He didn't cause Abraham's heart to become faithful. The list (Cannanite, Hittite, Amorite, Perizzite, Jebusite, Girgashite) comes from Gen 15:18-21, the same chapter where God gives Abraham the credit of righteousness for believing the gospel regarding his "seed" Jesus Christ after ratifying the covenant with him by passing between the split animals as a pillar of fire. No Calvinist or Reformed disputes that the people within the nation of Israel were God's chosen people because they were born as physical descendants of Abraham and that each member of the nation was not specifically chosen as an individual, but were chosen as a group by being a descendant of Abraham, Isaac, and Jacob. Why then is it too difficult to believe the same is true of Abraham's spiritual descendants as Christ defined it in John 8 and Paul defined it in Galatians 3-4 and Romans 4?
[Gal 3:6-9 NASB95] 6 Even so Abraham BELIEVED GOD, AND IT WAS RECKONED TO HIM AS RIGHTEOUSNESS. 7 Therefore, be sure that it is those who are of faith who are sons of Abraham. 8 The Scripture, foreseeing that God would justify the Gentiles by faith, preached the gospel beforehand to Abraham, [saying,] "ALL THE NATIONS WILL BE BLESSED IN YOU." 9 So then those who are of faith are blessed with Abraham, the believer.
[Rom 4:9-18 NASB95] 9 Is this blessing then on the circumcised, or on the uncircumcised also? For we say, "FAITH WAS CREDITED TO ABRAHAM AS RIGHTEOUSNESS." 10 How then was it credited? While he was circumcised, or uncircumcised? Not while circumcised, but while uncircumcised; 11 and he received the sign of circumcision, a seal of the righteousness of the faith which he had while uncircumcised, so that he might be the father of all who believe without being circumcised, that righteousness might be credited to them, 12 and the father of circumcision to those who not only are of the circumcision, but who also follow in the steps of the faith of our father Abraham which he had while uncircumcised. 13 For the promise to Abraham or to his descendants that he would be heir of the world was not through the Law, but through the righteousness of faith. 14 For if those who are of the Law are heirs, faith is made void and the promise is nullified; 15 for the Law brings about wrath, but where there is no law, there also is no violation. 16 For this reason [it is] by faith, in order that [it may be] in accordance with grace, so that the promise will be guaranteed to all the descendants, not only to those who are of the Law, but also to those who are of the faith of Abraham, who is the father of us all, 17 (as it is written, "A FATHER OF MANY NATIONS HAVE I MADE YOU") in the presence of Him whom he believed, [even] God, who gives life to the dead and calls into being that which does not exist. 18 In hope against hope he believed, so that he might become a father of many nations according to that which had been spoken, "SO SHALL YOUR DESCENDANTS BE."
[Gal 4:21-31 NASB95] 21 Tell me, you who want to be under law, do you not listen to the law? 22 For it is written that Abraham had two sons, one by the bondwoman and one by the free woman. 23 But the son by the bondwoman was born according to the flesh, and the son by the free woman through the promise. 24 This is allegorically speaking, for these [women] are two covenants: one [proceeding] from Mount Sinai bearing children who are to be slaves; she is Hagar. 25 Now this Hagar is Mount Sinai in Arabia and corresponds to the present Jerusalem, for she is in slavery with her children. 26 But the Jerusalem above is free; she is our mother. 27 For it is written, "REJOICE, BARREN WOMAN WHO DOES NOT BEAR; BREAK FORTH AND SHOUT, YOU WHO ARE NOT IN LABOR; FOR MORE NUMEROUS ARE THE CHILDREN OF THE DESOLATE THAN OF THE ONE WHO HAS A HUSBAND." 28 And you brethren, like Isaac, are children of promise. 29 But as at that time he who was born according to the flesh persecuted him [who was born] according to the Spirit, so it is now also. 30 But what does the Scripture say? "CAST OUT THE BONDWOMAN AND HER SON, FOR THE SON OF THE BONDWOMAN SHALL NOT BE AN HEIR WITH THE SON OF THE FREE WOMAN." 31 So then, brethren, we are not children of a bondwoman, but of the free woman.
[Isa 54:1 NASB95] 1 "Shout for joy, O barren one, you who have borne no [child;] Break forth into joyful shouting and cry aloud, you who have not travailed; For the sons of the desolate one [will be] more numerous Than the sons of the married woman," says the LORD.
So the adopted descendants of "the father of many nations" are more numerous than the physical descendants. Just as the physical descendants were not "chosen" as individuals, but were 'chosen' because of their kinship with Abraham due to God's promise, so too are the adopted descendants. This is GRACE because God didn't have to choose Abraham nor make a promise to his descendants, but He did... and therefore they are chosen when they are qualified as heirs.
[Rom 8:15-17 NASB95] 15 For you have not received a spirit of slavery leading to fear again, but you have received a spirit of adoption as sons by which we cry out, "Abba! Father!" 16 The Spirit Himself testifies with our spirit that we are children of God, 17 and if children, heirs also, heirs of God and fellow heirs with Christ, if indeed we suffer with [Him] so that we may also be glorified with [Him.]
Fellow heirs, in fact, with Christ who was also counted as a descendent of Abraham (which is how He was resurrected back to life/righteousness after becoming sin and having the sin of the whole world laid upon Him). The Law was unable to impart life (Gal 3:21), so Christ's resurrection had to come through another covenant. This was Abraham's eternal covenant (Gen 17:7).
[Heb 13:20 NASB95] 20 Now the God of peace, who brought up from the dead the great Shepherd of the sheep through the blood of the eternal covenant, [even] Jesus our Lord,
[Act 2:33 NASB95] 33 "Therefore having been exalted to the right hand of God, and having received from the Father the promise of the Holy Spirit, He has poured forth this which you both see and hear.
[Gen 17:7 NASB95] 7 "I will establish My covenant between Me and you and your descendants after you throughout their generations for an everlasting covenant, to be God to you and to your descendants after you.
As you can see, I'm not making any of this up or inventing it. I'm following the scripture and trusting only in the truth it gives. I don't trust man's flawed systems or denominations. Not one of them has the whole truth. I trust the Truth I read for myself in scripture. My theology comes directly from scripture. I'm unconcerned with "how many" people believe it, but only with whether it is what scripture says. I think it's good news, so I brings me joy to tell people this good news. It even unifies the descendants (Jews and Christians) and demonstrates we are truly brethren. Whereas the law divides and brings death (for all have sinned), we can both celebrate who we are in the Abrahamic covenant having been brought together into oneness with Christ.