A Christian cannot lose salvation

I want to use two verses in the old testament where I think God is talking about the new covenant. Which is the covenant with Christians. Then I want to ask a few questions. I will give you a new heart and put a new spirit within you; I will take the heart of stone out of your flesh and give you a heart of flesh. I will put My Spirit within you and cause you to walk in My statutes, And you will keep My judgments and do them. Ezekiel 36:26-27 And I will make an everlasting covenant with them, That I will not turn away from doing them good; but I will put My fear in their hearts so that they will not depart from Me. Jeremiah 32:40 Notice in Ezekiel 36:26-27 God says "He will" put His Spirit within us, And "He will cause us" to walk in His statutes. Then notice in Jeremiah 32:40 God says "He will" make an "everlasting" covenant with them. Then He goes on to say, "He will" put His fear in their hearts so that "they will not depart from Him. " So my questions are, How would a Christian turn away from God if Gods Spirit that he puts within us causes us to walk in His statutes? How is the covenant everlasting if we can break it, Aka lose salvation? How would we turn away from God if God said we will not depart from Him, Because He has put His fear in our hearts? God says He puts his Spirit within us and causes us to follow him, So it would seem to me that the new covenant, Aka Christians receive eternal life once He puts His Spirit within us, And gives us a new heart and new spirit within us. This new heart and spirit is, What is called being born again. Which is something that is required for eternal life. John 3:3 So the new covenant starts when we are born again. Meaning that once we are born again we have eternal life, Not after we die. Therefore, If anyone is in Christ, He is a new creation; old things have passed away; behold, All things have become new. 2 Corinthians 5:17 My 2nd argument and your rebuttal, With my rebuttal - If what I said above is true, And salvation is granted once you are born again. That would mean that you couldn't lose salvation because it is irrevocable according to Romans 11:29, And salvation is granted while still alive. It is true that Mathew 24:9-14 says, "But he who endures to the end shall be saved. " But, I don't see this as meaning they will be saved after they die. This verse actually goes in harmony with what I said above. The people who stand firm to the end are True Christians, Who have Gods Spirit within them, And Gods Spirit causes them to stand firm to the end. Mathew 24:9-14 also says, "At that time many will turn away from the faith and will betray and hate each other" Just because they turned away from the faith doesn't mean they were actually saved. These people I would say they fit into the false convert category again. According to this verse. 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. 1 John 2:19 Also take note that 1 John 2:19, Seems to suggest that anyone who leaves the Christian faith was never actually a Christian, Or saved in the first place. So if that's true no one can lose salvation if they were never Christians in the first place. In 2 Timothy 4:7-8. Some extra context of this verse is that this was Paul's last epistle before his martyrdom. Paul was chained to a Roman soldier when he wrote this epistle. The reason Paul was able to get through everything that he went through is because God gave him the strength. Paul is saying here he has faced all these trials and tribulations and made it through to the end. This verse to me doesn't really talk about when you are granted salvation. It just said he made it through to the end of his human life, And now he will be rewarded eternally. So will everyone else who have longed for his appearing. I disagree with Category D, Because if all I said above is true that would mean that the reason true Christians stand firm to the end is because of Gods doing and not ours. If they fall away they were never Christians to begin with. I think this fits into perfect harmony with this verse. For by grace you have been saved through faith, And that not of yourselves; it is the gift of God, Not of works, Lest anyone should boast. Ephesians 2:8-9 Our salvation is by grace through faith alone. Not by works. If we was to say that we "must" stand firm to the end to be saved. I would say technically that is wrong, Because now we would have something to boast about. Instead we stand firm to the end because we have been saved. Not to be saved. I do believe that there is a difference between faith, And saving faith though. Saving faith involves repentence, But this is still not works because faith and repentence are two sides of the same coin. Repentence means to change your mind. So of course if you have truly changed your mind you will start turning from sin and putting your faith, Aka trust in Jesus for salvation. We serve God because we are grateful he has saved us, Not to try and stay saved, Or try and earn salvation. Because we can't earn or stay saved. We cannot hit his perfect standard and we will fall short every time. This is why we need a savior, And need to put all our trust in Him and faith in Him to save us. Your 2nd argument, With my rebuttal - The first thing I want to say about 1 Corinthians 9:24-27, Is that I don't think the word prize is referring to salvation, Because if it was that would imply that salvation is a prize to be won. That would contradict Ephesians 2:8-9 where it says "and that not of yourselves; it is the gift of God, Not of works, Lest anyone should boast. " So that would leave two different questions. What is the prize he is referring to? Also, What can he be disqualified for? I think more context could help answer these questions. For though I am free from all men, I have made myself a servant to all, That I might win the more; and to the Jews I became as a Jew, That I might win Jews; to those who are under the law, As under the law, That I might win those who are under the law; to those who are without law, As without law (not being without law toward God, But under law toward Christ), That I might win those who are without law; to the weak I became as weak, That I might win the weak. I have become all things to all men, That I might by all means save some. Now this I do for the gospel"s sake, That I may be partaker of it with you. 1 Corinthians 9:19-23 If Paul was teaching we had to be under strict training to maintain salvation, He would be teaching works salvation, Or teaching that we must keep the law. Instead in the verse above he makes it clear he is not under the law, And he chooses to make himself a servant to all anyway. So that way he is able to reach people, And win them over to Jesus. It seems to me that the prize Paul is referring to is not the salvation of himself. He sees winning others to Jesus as the prize. He continues to submit, And make himself a servant, And get beat so that way he won't become disqualified to lead them to Jesus. If Paul was referring to his own salvation possibly being lost. It would also seem to contradict this verse. All that the Father gives Me will come to Me, And the one who comes to Me I will by no means cast out. John 6:37 My 3rd Argument - just as He chose us in Him before the foundation of the world, That we should be holy and without blame before Him in love, Having predestined us to adoption as sons by Jesus Christ to Himself, According to the good pleasure of His will, Ephesians 1:4-5 In Him you also trusted, After you heard the word of truth, The gospel of your salvation; in whom also, Having believed, You were sealed with the Holy Spirit of promise, Who is the guarantee of our inheritance until the redemption of the purchased possession, To the praise of His glory. Ephesians 1:13-14 Ephesians 1:4-5 says, "He chose us in Him before the foundation of the world" "that we should be holy and without blame before him in love" having "predestined" us to "adoption" as sons by Jesus Christ to Himself, According to the good pleasure of "His Will" Ephesians 1:13-14 says, After you trusted "Him, " after you hear the word of truth, And having believed. You were "sealed" with the "Holy Spirit of promise" who is the "guarantee of our inheritance" until the "redemption of the purchased possession, " to the praise of "His glory"