I said I was done here, but you brought up something I have to address.
Is there another Spirit that made them born again? No.
The Holy Ghost wasn't given until Pentecost.
John 16:7 KJV
Nevertheless I tell you the truth; It is expedient for you that I go away: for if I go not away, the Comforter will not come unto you; but if I depart, I will send him unto you.
Here's the thing. Being birthed in by the Spirit and being indwelt are two entirely different things. The birth from above, being born again, is the Spirit of life giving life to the dead in sins sinner. They are given faith and repentance and are saved. That has always been the case. Abraham was declared righteous before God. None can be born again and not be declared righteous.
Yes, they had the Spirit, but not in the plenitude we have it today. I think Adam Clarke's commentary on John 7:51 is really good...
Was not yet given - Δεδομενον, given is added by the Codex Vaticanus, (B.) the Syriac, all the Persic, later Syriac with an asterisk, three copies of the Slavonic, Vulgate, and all the Itala but three; and several of the primitive fathers. The word seems necessary to the completion of the sense.
Certain measures of the Holy Spirit had been vouchsafed from the beginning of the world to believers and unbelievers: but that abundant effusion of his graces spoken of by Joel, Joel 2:28, which peculiarly characterized the Gospel times, was not granted till after the ascension of Christ:
- Because this Spirit in its plenitude was to come in consequence of his atonement; and therefore could not come till after his crucifixion.
2. It was to supply the place of Christ to his disciples and to all true believers; and therefore it was not necessary till after the removal of his bodily presence from among them. See our Lord's own words, John 14:16-18, John 14:26; John 15:26; John 16:7-15.