If Jesus became Abraham's or the World's sin, was He still Holy?
Yes. Just as the priest would sacrifice the lamb, placing his hand on the head to transfer the sin of the nation or individual to it... the lamb was an acceptable substitution only if it was without spot or blemish... but prior to death it would have the sin of the person making the guilt offering transferred onto it. This transference didn't disqualify the lamb... it only had to be spotless until the ritual started. The transference was the lamb's purpose. Obviously, once it's blood began to drain, it wouldn't be spotless or without blemish anymore... that didn't disqualify that lamb mid-sacrifice.
If death did not exist before Adam sinned, what happened to the plants that he ate"
The Bible says life is in the blood. Plants don't have blood. The Bible uses the term "Nephesh Keyyah" when referring to soulish life. It never once uses this term in reference to plants... only to people and animals. We see this also in the fact that God gave Adam and Eve every green thing to eat. This demonstrates that the purpose of plants is to act as biological machinery, and they do not have "life" as the Bible defines it.
The curse (or wages) of sin (death) still exists, and unforgiven sinners face the second death.
I'm not understanding your question.
What verses says God preached the gospel of Christ, His birth, life, death and resurrection, to Abraham while Abraham was still living his physical life?
Gal 3:6-9 NASB 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.
26 For you are all sons of God through faith in Christ Jesus.
29 And if you belong to Christ, then you are Abraham's descendants, heirs according to promise.
The gospel is much more simple than we make it. Paul says here that God's statement "all the nations will be blessed in you" contained the full gospel of Jesus Christ. How we do we know it was talking about Jesus Christ? Paul says so 7 verses later:
Gal 3:16 NASB 16 Now the promises were spoken to Abraham and to his seed. He does not say, "And to seeds," as [referring] to many, but [rather] to one, "And to your seed," that is, Christ.
Of course, this is talking about the very verse Paul just quoted in Gal 3:6... Genesis 15:
Gen 15:5-6 KJV 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.
Gen 17:7 KJV 7 And I will establish my covenant between me and thee and thy seed after thee in their generations for an everlasting covenant, to be a God unto thee, and to thy seed after thee.
So according to Galatians 3:8, God himself preached the gospel to Abraham when he said "so shall thy seed be" and God was specifically talking about one seed - Jesus Christ (Gal 3:16). So when God preached the gospel of Jesus Christ to Abraham, and Abraham believed, he was made righteous. We are considered the children of Abraham and qualified as heirs of the promise God gave Abraham in Genesis 17:7 that his descendants or seed would inherit that everlasting covenant.
So Abraham is literally the first saved (made righteous) by grace through faith in the gospel of Jesus Christ. Jesus confirms this in John 8:
Jhn 8:56 NASB 56 "Your father Abraham rejoiced to see My day, and he saw [it] and was glad."
This adoption as children of Abraham is what is spoken of in Isaiah 54:1
Isa 54:1 NASB 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.
This is why God changes Abram's name to Abraham and calls him the "father of many nations" just before He promises those adopted descendants would inherit the everlasting covenant. That's the first 6 verses of Genesis 17!
God did not credit Abraham with righteousness, He credited Abraham's faith as righteousness.
Right.... but I can say "I paid for this merchandise" and someone could argue "no, your money paid for it." The semantics are a bit irrelevant. I agree, faith is the transaction medium in the salvation process. However, faith doesn't DIRECTLY qualify us for righteousness... that's a long held misconception. Abraham was the only one who ever obtained righteousness directly for his faith. The rest of us obtain righteousness indirectly by our faith in the gospel first qualifying us as the descendants of Abraham and then inheriting Christ's righteousness though our kinship with Abraham.
Luk 19:9 NASB 9 And Jesus said to him, "Today salvation has come to this house, because he, too, is a son of Abraham.
Hebrews 2:16
For assuredly He does not give help to angels, but He gives help to the descendant of Abraham.
Only those whose individual faith is credited by God as righteousness, are transferred into Christ and are made righteous. Only those await our adoption in glorified bodies at Christ's second coming.
I agree.
The Lamb of God takes away the sin of the world, not just Abraham's.
I agree. I didn't say that only Abraham's sin was forgiven, but that Christ had a 1:1 exchange with Abraham. Then through inheritance, that righteousness is inherited by the millions of people who will be counted as the descendants of Abraham by having the same faith in the gospel of Jesus Christ that Abraham had.
We do not inherit righteousness, we are made righteous, the circumcision of Christ.
Col 1:12 NASB
giving thanks to the Father, who has qualified us to share in the inheritance of the saints in Light.
Eph 1:13-14 NASB
13 In Him, you also, after listening to the message of truth, the gospel of your salvation--having also believed, you were sealed in Him with the Holy Spirit of promise, 14 who is given as a pledge of our inheritance, with a view to the redemption of [God's own] possession, to the praise of His glory.
Rom 8:15-17 NASB
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.]