But why does the emboldened red part mean that they could only have ever been fake believers all along and could not have ever been genuine believers?
I already thoroughly explained in post #116,551 why those who fell away were never genuine believers. Once again, those who receive final judgment are compared to land that
bears no vegetation or useful fruit, but rather bears thorns and thistles. We see in scripture where good fruit is a sign of true spiritual life and a lack of good fruit is a sign of false believers. (Matthew 3:8-10; 7:15-20; 12:33-35) In Matthew 7:15, we read - Beware of false prophets, who come to you in sheep’s clothing, but inwardly they are ravenous wolves. 16 You will
know them by their fruits. Do men gather grapes from
thornbushes or figs from
thistles? Did Jesus mention anything about these wolves in sheep's clothing previously being sheep? NO. Neither did the writer of Hebrews mention the land that bears thorns and thistles previously bearing vegetation or useful fruit. Vegetation and useful fruit is being
contrasted with thorns and thistles. It's one or the other.
Aren't you projecting a once saved always saved bias onto the passage which causes you to see 'unfruitful' as meaning 'never, ever truly believed'?
It's you who is projecting NOSAS bias onto the passage. Unfruitful simply means unfruitful. There is no indication here that it means was once fruitful. That's your bias.
And you must see, by your own argument using the Hebrews 6 passage, that the Hebrews ARE saved. The warnings we've been discussing are being given to genuinely saved people, not possibly unsaved people who think they're saved and only have a superficial association with God's genuinely saved people and the things of God.
The Hebrews that bear useful fruit and do not fall away ARE saved. The Hebrews that bear thorns and thistles and fall away are NOT saved.
Hebrews 6:9-12 NAS
9But, beloved,
we are convinced of better things concerning you, and things that accompany salvation (your fruitfulness), though we are speaking in this way (that barren fields get burned up in the end).
10For
God is not unjust so as to forget your work and the love which you have shown toward His name, in having ministered and in still ministering to the saints.
11And we desire that each one of you show the same diligence so as to realize the full assurance of hope until the end,
12so that you will not be sluggish, but imitators of those who through faith and patience inherit the promises.
He plainly says he is convinced they are not fields that will get burned up in the end, because they are fruitful, having genuine work and love in the name of God for the saints which God will not unjustly forget. That's talking about genuinely saved people, not potentially fake people.
Still, genuinely saved people are
contrasted with those who are not saved based on the
land that bears vegetation/useful fruit or thorns and thistles, in which the
latter does not accompany salvation.
And he tells these genuinely saved people to show that same diligence of faith and patience (notice he didn't say 'works') through which the promises are inherited. Without which (faith and the perseverance of faith) you can not inherit the promises, but instead will be burned up. So the warnings to not fall away from that believing are in fact being delivered to actual saved people, not fake believers.
Just as in Hebrews 3:14, those who
hold their confidence steadfast to the end (persevere) demonstrate that they
have become partakers of Christ. Perseverance is proof of genuine conversion. Although the letter of Hebrews is written to believers, not everyone in a group of professing believers is a genuine believer, hence the warning. It's not hard to find "nominal" Christians
mixed in with genuine Christians in various churches and even on multiple Christian forums, including Christian Chat.
And as to these warnings addressing the hypothetical case in which it is impossible that a true believer not persevere in faith to the end, they're just too pointed and serious for them to be about the hypothetical case of a genuine believer not believing and persevering in faith anymore.
You are entitled to your opinion, yet there are still some believers who hold to the hypothetical view. Self preservationists seem to love the idea that although Jesus "initially" saved them, it's a good thing they ultimately "pulled themselves up by their own bootstraps" and "kept themselves saved." Such people are boasting at the back door.
Yes, the warning will always work to keep the true believer close to God in faith and works of faith who wants to stay close to God, but what about the believer who doesn't want to anymore? That's not a hypothetical scenario. It happens. We can't just write off every 'believer' who quits on Christ as having never really been saved. That scenario is addressed to often and too seriously in scripture for it to be merely hypothetical. And experience shows it does happen.
Again, perseverance is proof of genuine conversion. Quitting on Christ demonstrates that faith was never firmly rooted and established from the start. His sheep hear His voice, follow Him and He gives them eternal life and they shall never perish or be snatched from His hand. (John 10:27-28) I find it interesting that EVERYONE I have ever talked with who claims to have previously been a Christian, but is no longer a Christian, could not give me a clear, concise answer to how they became a Christian in the first place. When I asked such people what they previously believed that caused them to become a Christian, they could not give me a concise answer to what it means to believe the gospel, which is a
red flag for me.