What doctrines are essential to the new birth?

Two Biblical facts. One's name is said to be blotted out because of sin, Exodus 32:33, Psalms 69:27-28. Or not to be blotted out, Revelation 3:5, 1 John 5:1-5. 1 John 5:9-13.

 

One book is for the living, so would be physical death, while another book is the lamb's Book of life, where those in there are eternally secured!

 

I believe in eternal security but only in the church age.
Now, the quoted statement, though potentially sound, is not true because it stems from an ignorance of how salvation works.
Getting saved is spoken of as a spiritual birth in the Bible. If a man has at some point in his life approached God as a guilty sinner and in his heart trusted nothing but the righteousness of Jesus Christ to justify him AT THAT MOMENT, then he was born again. The fact that he later got his doctrine messed up cannot disannul his earlier spiritual birth.
The problem is guys who never, AT ANY MOMENT, ever trusted only the righteousness of Christ to justify them. Those guys would be lost.

 

So no OT believer was eternally secured?

 

You got it [Except David because of a special covenant (2Sa.7) which turns out to be a figure of our N.T. salvation (Ro.4)].

 

I think one can be saved without believing in eternal security. I think the doctrine of eternal security and the definite endurance of the saints can be a help not to fall into trusting in works, but I do not think it is necessary to believe it in order to not trust in works or one’s own righteousness. I think when one runs into heresy is that if they say that the blood of Christ is not sufficient to cover the sins of those who fall away for a time. Peter fell away for a time, but he did not loose his salvation. The truly saved can neither totally nor finally fall away. Peter neither totally nor finally fell away. He just fell away for a time, but it is not a requisite to salvation to believe this doctrine of the definite endurance of the saved, that once one is saved they can neither totally nor finally fall away, and consequently cannot loose their salvation.

 

Those who deny eternal security can indeed be saved, just have a misunderstood of just what happened to us once saved by grace of goid!

 

Salvation has always been after the fall on same basis, so why would not all be eternally secured by God?

 

It has? Adam was saved by faith in Jesus Christ? Noah? Phineas? The Jews under the law?
Did the apostles know that salvation was through faith in the resurrection of Jesus Christ in the gospels?
Do you have verses to answer the above in the positive? Because the apostles sure were confused when Christ spoke of his death, let alone his resurrection.
No one denies that ultimately, it's the grace of God that saves a man, and the blood of Christ which allows his soul out of prison, but to declare that men under the law were saved by grace through faith in the resurrection of Jesus Christ ("looking forward to the cross") is a whole different story.

 

They had the Gospel preached to them even under the OT, as in Hebrews, correct?

 

Which gospel? There are many gospels in the scriptures. Here's a sample from my notes on the subject:

 

The Gospel was first announced in genesis 3, correct?

 

Adam was told about the death, burial, and resurrection about Jesus Christ the only begotten Son of God? Where?

 

He was told that there was to come a Messiah who would redeem His people, as that is the Great promise in the entire OT!

 

He was? Again, where? Need verses.

 

Genesis 3:15

 

Gen 3:15 And I will put enmity between thee and the woman, and between thy seed and her seed; it shall bruise thy head, and thou shalt bruise his heel.

A) Where in the verse did God address Adam?
B) Where in the verse did the word "Messiah" appear?
C) Granting the above two, where in the verse does God say that the Messiah would bring redemption?
D) Where in the verse does God mention "his people"?

Don't insert your own 20/20 rear-view into the words.

 

God imputed righteousness unto Phinehas under the law for a work:
Psa 106:30 Then stood up Phinehas, and executed judgment: and so the plague was stayed.
Psa 106:31 And that was counted unto him for righteousness unto all generations for evermore.

That's what the words of God say.

Paul explicitly told us that the law is not of faith (Gal.3:12) and then quoted Moses in Leviticus 18:5, twice, The man that doeth them shall live in them (Gal.3:12, Rom.10:5).

 

That is where the Gospel was first introduced