You mentioned Abraham in your opening post. However, you didn't explain why Abraham, who is our "Father of Faith," could hold such a title if water baptism hadn't yet been instituted. While Abraham held true Faith, so did Job, Moses, Caleb, Joshua, Samuel, and David to mention a few.
What do you think is the basis for these people being Pure, Righteous, Holy, and Blameless? Water baptism was yet to be instituted into the Christian Faith, so how could these people hold a status of Purity? We should keep in mind that there is one God, one Faith, and one Baptism. Therefore, the Faith that Abraham had is the same Faith we are to have today. He is our model of Faith, though Christ hadn't lived, died, and resurrected from the dead.
What do you think of what has been offered above?
John, the first baptistising prophet, foretold of Jesus soon to arrive with HIS gospel that agreed with repentance and faith in the greater one, Jesus' preaching of repentance from sin and believing His good news (the Gospel), foretelling of the ministry of Jesus, but not having for-knowledge of the finishing of Jesus's ministry as a man on earth, dying for mankind, yet his ministry foretold of the death, burial, and rising from the dead. of Jesus. Satan (the Devil) didn't catch on to that finishing truth either. Had that end been fully understood, men, as well as Satan might have hidden Jesus away somewhere to prevent that future necessity required to save believers in Jesus and what He did for us as God coming to mankind as a mere man, demonstrating how people ought to live, believing properly upon God.
Keep in mind the episode of Philip and the Egyptian eunuch (Acts 8) who responded to the gospel, desiring to mark his faith by being water baptized AFTER becoming a believer in Christ Jesus. The water baptism was a SIGN of belief that was a very uncommon action emphasized by John as the hope of salvation, but not resulting in salvation. That act came after after repentance from sin, as a sign of commitment to that faith level. J
esus never preached John"s water baptism as necessary for salvation, though introducing the ultimate belief of being IN HIM by grace through faith, the spiritual baptism into the holy trinity of God. Israel was baptized unto Moses, but the baptism into God marked the requirement of dying to sin (repentance), being buried to the former life (increasing in holiness not by works), and rising up with Christ Jesus to a whole new existence with Jesus, and the Holy Spirit, and Father God. It was Jesus who introduced life via guidance of the Holy Spirit, a concept not preached by John, whose disciples had no knowledge of (Acts 19:6 +).
It was that baptism far greater than John's, empowering effective gospel ministry beyond the initial mark of willingness to depart from sin (repentance). Jesus preached repentance and belief, not a power of a pool of water to empower, yet a SIGN of fulfilling of all righteousness as taught by John. It is a sweet sign of testimony before someone else of your righteous decision for Christ, but ought not be your only testimony before people.
That is far greater than when I joined the Navy swearing to uphold the U.S. Constitution, which I have kept after that commitment, both actions clearly in memory. That former lasting oath was "I, James Campbell, do solemnly swear that I will support and defend the Constitution of the United States against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; and that I will obey the orders of the President of the United States and the orders of the officers appointed over me, according to regulations and the Uniform Code of Military Justice. So help me God." It doesn't involve politics. I later solemnly affirmed allegiance to Christ and the word of God, and later adding specifically Jesus, and the Holy Spirit, and Father God, unto obeying what I hear of that Godhead. Military submission to leaders is marked with obedience and confirmed with a salute, while the eternal life is marked by us four, me on my knees in the company of the triune Godhead. Water baptism was like a salute, a sign of submission to greater, and obedience by law. The greater response is submission to God's word, His grace through faith, treasuring the commandments of the Lord Jesus to fulfill all by loving other people.