Now, you were talking about including all that the New Testament teaches on “being saved;” yet in your statements above you include only one of the three tenses that the Bible assures us of. 1) “saved” 2) “being saved” 3) “shall be saved” Paul does not consider it “immature thinking” if one is assured, by God’s Word, of their salvation.

Bible writers, however, are unanimous in condemning those who think that because they are saved; they can do as they please. I think that Catholics would have to agree that it does not work this way.
I’ve linked Scripture notations] to
Biblegateway.com.
I agree that there are 3 “tenses” concerning “salvation” found in the Bible.
First we receive salvation by faith and baptism
Mark 16:16] and the Holy Spirit moves into our temples/souls/hearts and resides there
Galatians 3:2]. It is God Who sanctifies us/justifies us/saves us.
1 Corinthians 6:11, Romans 2:15-16]
I have been saved. 2 Cor. 5:17 “Therefore, if anyone is
in Christ, he is a new creation; old things have passed away; behold, all things have become new.”
Titus 3:5]
I am being saved now. 1 Cor.15:2 “by which also
you are saved,
if you hold fast that word which I preached to you—
unless you believed in vain.”
I will be saved in the future. Rom 5:9 “Much more then, having now been justified by His blood, we
shall be saved from wrath through Him.”
We are “assured” of salvation
only if we remain/abide in Christ until death.
Is there a “guarantee” of our inheritance to eternal life? Yes! It is the Holy Spirit living within/
abiding in our temples/hearts/souls
at our deaths.
2 Corinthians 5:5 “Now He who has prepared us for this very thing is
God, who also has given us the Spirit as a guarantee.”
2 Corinthians 1:22, Ephesians 1:13-14]
However, the Holy Spirit cannot abide/remain in a sinful temple/soul/heart. What if we sin mortal sins and the Holy Spirit no longer lives/abides within our souls?
1 Corinthians 3:16-18 “Do you not know that
you are the temple of God and that the Spirit of God dwells in you? 17
If anyone defiles the temple of God, God will destroy him. For the temple of God is holy, which temple you are. 18 Let no one deceive himself. If anyone among you seems to be wise in this age, let him become a fool that he may become wise.”
1 Corinthians 6:19]
If we defile our “temples” with mortal sins (sins that cause the death of our souls)
[John 8:51], then the Holy Spirit leaves us, and Jesus will not “know” us on Judgment Day.
Jesus will only know/recognize those persons who have the Holy Spirit abiding within them at their deaths. If the Holy Spirit is not abiding/living within their souls at their deaths, then God destroys them (His wrath casts them into hell for eternity).
[Romans 2:7-8]
Matthew 7:23 “And then I will declare to them, ‘
I never knew you; depart from Me, you who practice lawlessness!’”
What does “practice lawlessness” mean? It means “commit sin.”
1 John 3:4 “Whoever commits sin also commits lawlessness, and sin is lawlessness.”
2 Corinthians 13:5 “Examine yourselves as to whether you are in the faith. Test yourselves. Do you not know yourselves, that Jesus Christ is in you?—
unless indeed you are disqualified.”
Our inheritance to eternal life is lost when we disqualify ourselves by sin.
**
Salvation is a life-long process, not a one-time event.** We must endure to the end of our lives in God’s grace in order to be saved. [Matthew 10:22, Matthew 13:21, Matthew 24:13, 2 Thessalonians 1:3-10, 2 Timothy 2:12]](
Matthew 10:22, Matthew 13:21, Matthew 24:13, 2 Thessalonians 1:3-10, 2 Timothy 2:12 NKJV - And you will be hated by all for My - Bible Gateway)
If we deny Christ by our sinful works, then we will not be saved. [Titus 1:16, Revelation 2:13]](
Titus 1:16, Revelation 2:13 NKJV - They profess to know God, but in works - Bible Gateway)
Sometimes the Church is accused of teaching “salvation by works,” but this is an empty accusation. This idea has been consistently condemned by the Church. Good works are required by God because he requires obedience to his commands
Matt. 6:1-21, 1 Cor. 3:8] and promises to reward us with eternal life if we obey
Matt. 25:34-40, Rom. 2:6-7, Gal. 6:6-10, James 1:12]. But even our obedience is impossible without God’s grace; even our good works are God’s gift
Rom. 5:5, Phil. 2:13]. This is the real biblical plan of salvation.
James 2:24 “You see then that a man is justified by works, and not by faith only.”