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If scripture is so plain, then why do some of your Co-Religionists disagree with your notion of “Eternal Security.”

Topical organization of scriptures that refute “Eternal Security”

1 Parable of sower

Mark 4:16 (Luke 8:13) “And in a similar way these are the ones on whom seed was sown on the rocky places, who, when they hear the word, immediately receive it with joy; (they believe for a while) and they have no firm root in themselves, but are only temporary; then, when affliction or persecution arises because of the word, immediately they fall away.
2 Fallen from grace passage:

Galatians 5:4 “You have been severed from Christ, you who are seeking to be justified by law; you have fallen from grace.”
3 Pruning passages:

John 15:5-6 “I am the vine, you are the branches; he who abides in Me, and I in him, he bears much fruit; for apart from Me you can do nothing. If anyone does not abide in Me, he is thrown away as a branch, and dries up; and they gather them, and cast them into the fire, and they are burned.”
Romans 11:19-23 “You will say then, “Branches were broken off so that I might be grafted in.” Quite right, they were broken off for their unbelief, but you stand by your faith. Do not be conceited, but fear; for if God did not spare the natural branches, neither will He spare you. Behold then the kindness and severity of God; to those who fell, severity, but to you, God’s kindness, if you continue in His kindness; otherwise you also will be cut off. And they also, if they do not continue in their unbelief, will be grafted in; for God is able to graft them in again.”
4 Hebrews Passages:

Hebrews 6:4-6 For in the case of those who have once been enlightened and have tasted of the heavenly gift and have been made partakers of the Holy Spirit, and have tasted the good word of God and the powers of the age to come, and then have fallen away, it is impossible to renew them again to repentance, since they again crucify to themselves the Son of God, and put Him to open shame.
Hebrews 10:26-27 For if we go on sinning willfully after receiving the knowledge of the truth, there no longer remains a sacrifice for sins, but a certain terrifying expectation of judgment, and the fury of a fire which will consume the adversaries.”
Hebrews 10:38-39 “But My righteous one shall live by faith; And if he shrinks back, My soul has no pleasure in him. But we are not of those who shrink back to destruction, but of those who have faith to the preserving of the soul.”
5 Doctrinal Apostasy passages:

Acts 20:17,28-30 “And from Miletus he sent to Ephesus and called to him the elders of the church.” ... “I know that after my departure savage wolves will come in among you, not sparing the flock; and from among your own selves men will arise, speaking perverse things, to draw away the disciples after them.”
1 Timothy 1:18-21 “fight the good fight, keeping faith and a good conscience, which some have rejected and suffered shipwreck in regard to their faith. Among these are HYMENAEUS and Alexander”
2 Timothy 2:16-18 But avoid worldly and empty chatter, for it will lead to further ungodliness, and their talk will spread like gangrene. Among them are HYMENAEUS and Philetus, men who have gone astray from the truth saying that the resurrection has already taken place, and thus they upset the faith of some.
1 Timothy 4:1 “But the Spirit explicitly says that in later times some will fall away from the faith, paying attention to deceitful spirits and doctrines of demons”
1 Timothy 6:20-21 “O Timothy, guard what has been entrusted to you, avoiding worldly and empty chatter and the opposing arguments of what is falsely called “knowledge”-which some have professed and thus gone astray from the faith.”
2 Peter 2:1 “But false prophets also arose among the people, just as there will also be false teachers among you, who will secretly introduce destructive heresies, even denying the Master who bought them, bringing swift destruction upon themselves.”
2 Peter 3:17 “You therefore, beloved, knowing this beforehand, be on your guard lest, being carried away by the error of unprincipled men, you fall from your own steadfastness”
2 John 8-9 “Watch yourselves, that you might not lose what we have accomplished, but that you may receive a full reward. Anyone who goes too far and does not abide in the teaching of Christ, does not have God; the one who abides in the teaching, he has both the Father and the Son.”
6 Moral Apostasy passages:

1 Timothy 6:9-10 “But those who want to get rich fall into temptation and a snare and many foolish and harmful desires which plunge men into ruin and destruction. For the love of money is a root of all sorts of evil, and some by longing for it have wandered away from the faith, and pierced themselves with many a pang.”
2 Peter 2:20-22 “For if after they have escaped the defilements of the world by the knowledge of the Lord and Savior Jesus Christ, they are again entangled in them and are overcome, the last state has become worse for them than the first. For it would be better for them not to have known the way of righteousness, than having known it, to turn away from the holy commandment delivered to them. It has happened to them according to the true proverb, “A dog returns to its own vomit,” and, “A sow, after washing, returns to wallowing in the mire.””
James 5:19-20 “My brethren, if any among you strays from the truth, and one turns him back, let him know that he who turns a sinner from the error of his way will save his soul from death, and will cover a multitude of sins.”
7 Revelation passages:

Revelation 2:4-5 “’But I have this against you, that you have left your first love. ‘Remember therefore from where you have fallen, and repent and do the deeds you did at first; or else I am coming to you, and will remove your lampstand out of its place-unless you repent.”
Revelation 3:5 “’He who overcomes shall thus be clothed in white garments; and I will not erase his name from the book of life, and I will confess his name before My Father, and before His angels.
Revelation 3:16-17 ‘So because you are lukewarm, and neither hot nor cold, I will spit you out of My mouth. ‘Because you say, “I am rich, and have become wealthy, and have need of nothing,” and you do not know that you are wretched and miserable and poor and blind and naked”
8 Old Testament passages

Ezekiel 18:24-26 “But when a righteous man turns away from his righteousness, commits iniquity, and does according to all the abominations that a wicked man does, will he live? All his righteous deeds which he has done will not be remembered for his treachery which he has committed and his sin which he has committed; for them he will die. “Yet you say, ‘The way of the Lord is not right.’ Hear now, O house of Israel! Is My way not right? Is it not your ways that are not right? “When a righteous man turns away from his righteousness, commits iniquity, and dies because of it, for his iniquity which he has committed he will die.”
Other scriptural arguments that refute “Eternal Security”

A. The fact the Bible exhorts to faithfulness proves one can be lost

be steadfast immovable: 1 Cor 15:58
If these qualities are yours...2 Pe 1:5-11
we will reap if we do not grow weary: Gal 6:9
be faithful unto death and I will give crown of life: Rev 2:10
practice these things and God will be with you: Phil 4:9
B. Man has a free will: Josh 24:15 to argue otherwise is nonsense and is a veiled form of existentialism

C. The Bible clearly prophesied some would fall away: Acts 20:28; 1 Ti 4:1

D. Christians are to restore the fallen: Gal 6:1; Jas 5:19-20