Like Paul illustrates for us from Romans 11, Jesus teaches the same thing.
Yes, I fully agree with this. Paul taught that eternal life is a gift from God in Rom 6:23, and that God's gifts are irrevocable in Rom 11:29. And Jesus taught that those to whom He gives eternal life WILL NEVER PERISH in John 10:28. Their teaching is completely compatible.
No one has shown that neither taught eternal security.
As long as the son is disconnected from the Father, he is dead spiritually through unbelief (disobedience).
I have never found the word "disconnected" in the Bible and don't know what you mean by this word.
I do find words like abiding, and remaining. But 'disconnected' rings of severed relationship, which I would reject on the basis that birth parent to child relationship, whether physical or spiritual, cannot be severed. And no one has shown from Scripture that such a relationship has EVER been severed.
So please choose a biblical word.
You seem to ignore the plain and clear language that is used by the Lord Jesus in His teaching.
...for this my son was dead and is alive again; he was lost and is found.’ And they began to be merry.
Luke 15:24
Easy. Fellowship between them was "dead". Not relationship. The son remained the son throughout the parable, and the father remained the father. That did not change. The only thing that did change was fellowship. It was severed or broken or died at the beginning of the parable and was restored at the end of the parable.
If you disagree, please explain.
The issue is not whether those who turn away from God stop being a son or not, since it has been proven that sons of God can in fact be cast down to hell. 2 Peter 2:4
This is another apples to oranges comparison, which is not valid. I'm talking only about the spiritual and physical relationship between parent and child. That cannot be applied to angels in any sense, so it is invalid.
[QUTOE]It's whether a son of God "by faith", stops having the faith by which he became a son of God, and therefore returns to being an
un-believer who is dead spiritually.[/QUOTE]
Please show me any verse that teaches that when one stops believing, they stop being a son, or return to being spiritually dead. In fact, that is impossible, because those who have been given eternal life CANNOT PERISH.
iow, eternal life CANNOT die. If it can die, it wasn't eternal to begin with. That is the huge problem with conditional security.