What the *church* has to say is totally irrelevant to what is reality. I believe God and what He told us in Scripture and if someone wants to continue to put themselves in bondage to works and legalism, that by all means is their prerogative, but I'm not going there again. Once was enough for me.
We sin because we are sinners. We are not sinners because we sin, as if, if we didn't sin, we'd be OK with God. The reason we can't get into heaven is that we are not pure, we're sinners. Until that is dealt with, by death, the penalty for sin, there is no way to enter.
We are not OK with God because of our sin nature. That nature has been dealt with on the cross. IN CHRIST, anyone who has put their trust in Him has already died and therefore the penalty of that sinful nature has been dealt with. I already have a place in heaven, not just reserved for me, but there now.
Ephesians 1:3-14 Blessed be the God and Father of our Lord Jesus Christ, who has blessed us in Christ with every spiritual blessing in the heavenly places, 4 even as he chose us in him before the foundation of the world, that we should be holy and blameless before him. In love 5 he predestined us for adoption as sons through Jesus Christ, according to the purpose of his will, 6 to the praise of his glorious grace, with which he has blessed us in the Beloved.
7 In him we have redemption through his blood, the forgiveness of our trespasses, according to the riches of his grace, 8 which he lavished upon us, in all wisdom and insight 9 making known to us the mystery of his will, according to his purpose, which he set forth in Christ 10 as a plan for the fullness of time, to unite all things in him, things in heaven and things on earth.
11 In him we have obtained an inheritance, having been predestined according to the purpose of him who works all things according to the counsel of his will, 12 so that we who were the first to hope in Christ might be to the praise of his glory. 13 In him you also, when you heard the word of truth, the gospel of your salvation, and believed in him, were sealed with the promised Holy Spirit, 14 who is the guarantee of our inheritance until we acquire possession of it, to the praise of his glory.
Galatians 2:19-21 19 For through the law I died to the law, so that I might live to God. 20 I have been crucified with Christ. It is no longer I who live, but Christ who lives in me. And the life I now live in the flesh I live by faith in the Son of God, who loved me and gave himself for me. 21 I do not nullify the grace of God, for if righteousness were through the law, then Christ died for no purpose.
2 Corinthians 5:17 17 Therefore, if anyone is in Christ, he is a new creation. The old has passed away; behold, the new has come.
Romans 6:1-11 What shall we say then? Are we to continue in sin that grace may abound? 2 By no means! How can we who died to sin still live in it? 3 Do you not know that all of us who have been baptized into Christ Jesus were baptized into his death? 4 We were buried therefore with him by baptism into death, in order that, just as Christ was raised from the dead by the glory of the Father, we too might walk in newness of life.
5 For if we have been united with him in a death like his, we shall certainly be united with him in a resurrection like his. 6 We know that our old self was crucified with him in order that the body of sin might be brought to nothing, so that we would no longer be enslaved to sin. 7 For one who has died has been set free from sin. 8 Now if we have died with Christ, we believe that we will also live with him. 9 We know that Christ, being raised from the dead, will never die again; death no longer has dominion over him. 10 For the death he died he died to sin, once for all, but the life he lives he lives to God. 11 So you also must consider yourselves dead to sin and alive to God in Christ Jesus.
John 10:25-29 25 Jesus answered them, “I told you, and you do not believe. The works that I do in my Father's name bear witness about me, 26 but you do not believe because you are not among my sheep. 27 My sheep hear my voice, and I know them, and they follow me. 28 I give them eternal life, and they will never perish, and no one will snatch them out of my hand. 29 My Father, who has given them to me, is greater than all, and no one is able to snatch them out of the Father's hand.
Anyone who doesn't know if they belong to Jesus most likely doesn't know Him and would or course, be unsure if they are saved. When someone has the Spirit of God living in them, they KNOW it. No one can have God's presence in his spirit and not know it.
We don't have to work to get saved (Ephesians 2) and we don't have to work to stay saved (Galatians 3).
The Catholic church teaches dealing with the sins, not dealing with the sinner. Forgiveness deals with the sins. Regeneration deals with the sinner and gives us fellowship with God again.
That is your prerogative by virtue of your God given the free will. As I said earlier, sin is a conscious choice.
I believe God and what He told us through Scripture too. Remember the Church, that Christ founded and which provided you the Scripture you quoted, holds, from Scripture, that the doctrine of Once Saved Always Saved is not valid.
Professing faith does not eliminate free will or concupiscence. It does not protect us from sinning nor render sin inconsequential. In Matthew 6:15 Jesus tells us that "But if you do not forgive others their sins, your Father will not forgive your sins."
I would ask that you consider the following Scripture:
"If we deliberately keep on sinning after we have received the knowledge of the truth, no sacrifice for sins is left, but only a fearful expectation of judgment and of raging fire that will consume the enemies of God. Anyone who rejected the law of Moses died without mercy on the testimony of two or three witnesses. How much more severely do you think someone deserves to be punished who has trampled the Son of God underfoot, who has treated as an unholy thing the blood of the covenant that sanctified them, and who has insulted the Spirit of grace? For we know him who said, “It is mine to avenge; I will repay,”and again, “The Lord will judge his people.” It is a dreadful thing to fall into the hands of the living God." - Hebrews 10:19-25
So Judgement is what happens to other people? We really do have a different Bible.