Can One’s Salvation Be Given Up?

I am not asking this question from a theological perspective, but instead from a matter of fact. I tend to lean towards yes, one can “Give up” their salvation.

Scripture states that salvation cannot be take from a believer, but there are passages that indicate that a person can essentially forgo this free gift of God. I have listed verses below that I believe can verify this concept:

Matthew 5:13
Matthew 3:10
Mark 4:1-20
Revaluation 3:14-19

If you agree or disagree, please feel to explain why.

Who are those who lose faith, and now have become against Christ, who deny Jesus?

John calls them anti Christ.

I John 2 22 Who is a liar but he who denies that Jesus is the Christ? He is antichrist who denies the Father and the Son. 23 Whoever denies the Son does not have the Father either; he who acknowledges the Son has the Father also.

john also tells us if They were ever saved, and they gave up their salvation, or if they were never saved to begin with

18 Little children, it is the last hour; and as you have heard that the[d] Antichrist is coming, even now many antichrists have come, by which we know that it is the last hour. 19 They went out from us, but they were not of us; for if they had been of us, they would have continued with us; but they went out that they might be made manifest, that none of them were of us.

Only those that salvation is a done and dusted deal in the past and not in the future will dispute.

1 Cor 15:1Now, brothers and sisters, I want to remind you of the gospel I preached to you, which you received and on which you have taken your stand. 2By this gospel you are saved, if you hold firmly to the word I preached to you. Otherwise, you have believed in vain.

Salvation = a new creation. You cannot stop being what you are. It's like a dog trying to choose to be a cat. False Christians however never left Satan and easily sink to that level every day.

Our covenant with God is an unconditional covenant, sealed by Jesus's blood on the cross.

During the 4 Gospels, Jesus have not died yet, so those passages from Matthew and Mark should not be used to explain how our unconditional covenant works. All the Jews from Matthew to John were still under the law covenant, which was a conditional one.

In regards to 1 Corinthians 15:2, the "if you hold firmly to the word I preached to you" clause is added (not because genuine believers will fail to hold firmly to the word preached to them and lose their salvation) but because there are "nominal" Christians who will fail to hold firmly to the word that Paul preached because their believing was never firmly rooted and established from the start and Paul does not want to give such people false assurance of salvation. Hence the "if" clause. Paul goes on to say - "unless you believed in vain" and to believe in vain is to believe without cause or without effect, to no purpose.

Those who hold fast to the word/the gospel that Paul preached to them demonstrate that their belief was firmly rooted and established in the gospel from the start, which resulted in salvation. There are genuine Christians and there are "nominal" Christians. There are genuine believers and there are make believers and it's not hard to find both groups mixed together, even on Christian Chat.

MAT 10:22 He that Endureth to the end
LUKE 21:19 In your patience possess ye your soles .
JOHN 6:27 Endureth unto everlasting life .
1 TIMOTHY 5:15 For some are already turned aside after Satan .
JAMES 5:19-20 Brethren ,if any of you do err from the truth,
1 PETER 5:8 Devil, as a roaring lion , walking about , seeking whom he may devour . [If your lost he has already got you .]
2 PET 2:18-22 the dog & sow that was wash & got Dirty again .
1 JOHN 5:3-5 overcometh the world
REV 12:17 , REV 14:12 , REV 16:15 , REV 22:14 [ They are keeping GODs commandments ]
And there's many more that shows us , that we haft to keep pressing on .
GOD bless as HE sees fit .
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One can turn their back and lose faith, but God remains faithful. Circumstances in life may cause a believer to drift away from the Lord, but the Lord never loses that which is His.

Once you have been born from your mother's womb, you can not become unborn. The same is true with your spiritual birth. A spiritually born person can become disobedient to God's commandments, and in need of repentance, but when he is actively participating in sin, he has lost his fellowship with God, until he repents, but he has not lost his inheritance of eternal life.

ZEPH. 1 [3] I will consume man and beast; I will consume the fowls of the heaven, and the fishes of the sea, and the stumblingblocks with the wicked; and I will cut off man from off the land, saith the Lord. [4] I will also stretch out mine hand upon Judah, and upon all the inhabitants of Jerusalem; and I will cut off the remnant of Baal from this place, and the name of the Chemarims with the priests; [5] And them that worship the host of heaven upon the housetops; and them that worship and that swear by the Lord, and that swear by Malcham; [6] And THEM THAT ARE TURNED BACK FROM THE LORD; AND THOSE THAT HAVE NOT SOUGHT THE LORD, nor enquired for him. [7] Hold thy peace at the presence of the Lord God: for the DAY OF THE LORD is at hand: for the Lord hath prepared a sacrifice, he hath bid his guests.

If something is being said in "Day of the Lord" scriptures you can bet the ranch, it will come to pass. What might it mean that "THEM THAT ARE TURNED BACK FROM THE LORD" means?

Wouldn’t you come to the conclusion from those verses that there is a possibility that a person can forfeit salvation? If one accepts salvation can’t one reject it as well?

What if that person chooses not to repent?

The Matthew and Mark passages are not to the Church, no Christian in sight. The Revelation passage is explaining how the Lord feels about His children who aren't living for Him. They make Him sick.

If Jesus wasn’t speaking to His followers whom were those words meant for?

The Jews, the nation of Israel. What constitutes being a follower of Jesus Christ? How does on become a Christian?

Accepting Jesus and Lord as Savior. So if this was for only the Jews, shouldn’t we assume that Jesus entire ministry was only for the Jews?

Accepting Jesus as Lord and Savior? How about repenting and putting your faith in the death, burial and resurrection of Jesus for your sins. Is that not the gospel of Jesus Christ?

The verse is clear, doesn't need this kind of an explanation.

Yes, of course that is part of it, but I didn’t want to stray from the topic of the OP. So if those verses I used for this were for the Jews, why would think anything Jesus said or did would be given over to the Gentiles?

Jesus was instructing the Jews on living in the kingdom of heaven, the Jews earthly physical kingdom as promised to them all throughout the OT. The death, burial and resurrection was hid at the time.