Sigh. Here are a few to begin with (in addition to the one already quoted, which you have yet to address):
Not one single verse shows loss of eternal life.
1 Timothy 4:1 But the Spirit saith expressly, that in later times some shall fall away from the faith, giving heed to seducing spirits and doctrines of demons,
We have eternal life because we are born-again by faith. It is not our faith that keeps us born-again, it is God's power.
We have faith in Him as His children, and that faith gets us rewards. Hebrews 11:6
If that faith is gone, so are the rewards. Still born-again though. Still sealed by the Holy Spirit till the day of redemption.
Hebrews 6:4 For as touching those who were once enlightened and tasted of the heavenly gift, and were made partakers of the Holy Spirit, 5 and tasted the good word of God, and the powers of the age to come, 6 and [then] fell away, it is impossible to renew them again unto repentance; seeing they crucify to themselves the Son of God afresh, and put him to an open shame.
When you read the first 3 verses of this chapter you can see that this is not talking about a believer losing his salvation/ born-again state.
Hebrews 3:12 Take heed, brethren, lest haply there shall be in any one of you an evil heart of unbelief, in falling away from the living God: 13 but exhort one another day by day, so long as it is called To-day; lest any one of you be hardened by the deceitfulness of sin: 14 for we are become partakers of Christ, if we hold fast the beginning of our confidence firm unto the end: 15 while it is said, To-day if ye shall hear his voice, Harden not your hearts, as in the provocation.
16 For who, when they heard, did provoke? nay, did not all they that came out of Egypt by Moses?
17 And with whom was he displeased forty years? was it not with them that sinned, whose bodies fell in the wilderness?
18 And to whom sware he that they should not enter into his rest, but to them that were disobedient?
19 And we see that they were not able to enter in because of unbelief.
Could not enter the promised land because of unbelief. We need to continue to believe, not to be born-again as that is a done deal, but to have a victorious Christian life.
Hebrews 10:26 For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more a sacrifice for sins, 27 but a certain fearful expectation of judgment, and a fierceness of fire which shall devour the adversaries.
28 A man that hath set at nought Moses law dieth without compassion on [the word of] two or three witnesses: 29 of how much sorer punishment, think ye, shall he be judged worthy, who hath trodden under foot the Son of God, and hath counted the blood of the covenant wherewith he was sanctified an unholy thing, and hath done despite unto the Spirit of grace?
30 For we know him that said, Vengeance belongeth unto me, I will recompense. And again, The Lord shall judge his people.
31 It is a fearful thing to fall into the hands of the living God.
This is not talking about a child of God. But you say it says he was sanctified by the blood.
10:10 shows all are sanctified. That is Christ died for all, and all are set apart. Not everybody gets saved as Universalists teach.
10 By the which will we are sanctified through the offering of the body of Jesus Christ once
for all.
Hebrews 10:39 But we are not of them that shrink back unto perdition; but of them that have faith unto the saving of the soul.
Our souls are not going to be with Jesus in the afterlife, our spirits.
so the perdition here is not talking about the Lake of fire.
The word for perdition is G684. It means ruin or loss. It can be physical, spiritual or eternal.
So the context of the verse must determine which it is. Our souls are not eternal.
Revelation 2:4 But I have [this] against thee, that thou didst leave thy first love.
5 Remember therefore whence thou art fallen, and repent and do the first works; or else I come to thee, and will move thy candlestick out of its place, except thou repent.
This is a message to a church, how can it be about individual loss of salvation?
Romans 11:19 Thou wilt say then, Branches were broken off, that I might be grafted in.
20 Well; by their unbelief they were broken off, and thou standest by thy faith. Be not highminded, but fear:
21 for if God spared not the natural branches, neither will he spare thee.
22 Behold then the goodness and severity of God: toward them that fell, severity; but toward thee, God's goodness, if thou continue in his goodness: otherwise thou also shalt be cut off.
Cut off from what? 11:29 says God's gifts, one of which is eternal life, are irrevocable.
Matthew 24:10 And then shall many stumble, and shall deliver up one another, and shall hate one another.
11 And many false prophets shall arise, and shall lead many astray.
12 And because iniquity shall be multiplied, the love of the many shall wax cold.
13 But he that endureth to the end, the same shall be saved.
Saved from what?
Do you believe in salvation by grace? Or works?
James 1:12 Blessed is the man that endureth temptation; for when he hath been approved, he shall receive the crown of life, which [the Lord] promised to them that love him.
We are saved by grace through faith. We do good works for crowns, not to get or stay saved.
James 5:19 My brethren, if any among you err from the truth, and one convert him; 20 let him know, that he who converteth a sinner from the error of his way shall save a soul from death, and shall cover a multitude of sins.
You quoting this is funny as it contradicts an earlier quote of yours, Hebrews 6:4-6, where it says it impossible once someone has fallen away to renew them again to repentance.
1 Thessalonians 3:8 8 for now we live, if ye stand fast in the Lord.
Now our salvation is dependent on others standing fast?
Paul did not believe his salvation was dependent on others standing fast, because Demas forsook him.
When others stand fast we have joy, this has nothing to do with our salvation.