So yes, I DO think these verses mean what I said originally:
--->if one in continuously (constantly) committing a sin they claim to have repented from then they were never saved in the first place.
Logically, that’s a self-fulfilling prophesy.
They could have been Saved and elected to give up their Salvation. Paul talks about this quit a bit where Christians were forsaking the faith.
That verse says nothing of they where never saved in the first place.
Romans 10: 26-31
For if we go on sinning willfully after receiving the knowledge of the truth, there no longer remains a sacrifice for sins, but a terrifying expectation of judgment and the fury of a fire which will consume the adversaries. Anyone who has set aside the Law of Moses dies without mercy on the testimony of two or three witnesses. How much severer punishment do you think he will deserve who has trampled under foot the Son of God, and has regarded as unclean the blood of the covenant by which he was sanctified, and has insulted the Spirit of grace? For we know Him who said, “Vengeance is Mine, I will repay.” And again, “The Lord will judge His people.” It is a terrifying thing to fall into the hands of the living God.
2 Peter 2:20-22
For if, after they have escaped the defilements of the world by the knowledge of the Lord and Savior Jesus Christ, they are again entangled in them and are overcome, the last state has become worse for them than the first. For it would be better for them not to have known the way of righteousness, than having known it, to turn away from the holy commandment handed on to them. It has happened to them according to the true proverb, “A dog returns to its own vomit,” and, “A sow, after washing, returns to wallowing in the mire.”
These scriptures address Christians, basically warning against sinning willfully, and that the judgment for Christians who fall away will be worse.