Is The Doctrine Of Unconditional Eternal Security Scriptural?
Here are my reasons I do not believe in forced preservation of faith unto salvation. I do believe and have observed people lose belief in Christ due to sin, grief, or anger.
On the other hand for the faithful I believe in eternal security in Christ. The key part is in Christ. Scripture talks about abide in Christ or else the vines will be pruned away and burned up.
Scripture also talks about how even the Israelites who saw and believed God after parting the red sea but by the time it came to enter the promise land or promise rest they was not permitted to enter due to sin and disobedience. This reference is found in Hebrews.
Scripture also puts dire warnings to the early churches to protect themselves from false teachers that will lead them astray. For example Paul was warning Ephesus to fight the spiritual warfare of evil but yet in Revelation the church of Ephesus had fallen far enough away to be listed as a dire warning to all future churches. Revelation 2
Yet I hold this against you: You have forsaken the love you had at first. 5 Consider how far you have fallen! Repent and do the things you did at first. If you do not repent, I will come to you and remove your lampstand from its place. 6 But you have this in your favor: You hate the practices of the Nicolaitans, which I also hate.
7 Whoever has ears, let them hear what the Spirit says to the churches.
To the one who is victorious, I will give the right to eat from the tree of life, which is in the paradise of God.
Paul even speaks on disciplining his body to constantly make sure he wouldn't be disqualified
But I discipline my body and keep it under control, lest after preaching to others I myself should be disqualified.
Or Paul also speaking on running the race with perseverance
Do you not know that in a race all the runners run, but only one gets the prize? Run in such a way as to get the prize.
Everyone who competes in the games goes into strict training. They do it to get a crown that will not last, but we do it to get a crown that will last forever.
Also to the Church in Smyrna Revelation 2:
8 “And to the angel of the church in Smyrna write: ‘The words of the first and the last, who died and came to life.
9 “‘I know your tribulation and your poverty (but you are rich) and the slander of those who say that they are Jews and are not, but are a synagogue of Satan. 10 Do not fear what you are about to suffer. Behold, the devil is about to throw some of you into prison, that you may be tested, and for ten days you will have tribulation.
Be faithful unto death, and I will give you the crown of life.
Everything involves the free will relationship of surrendering ones life out of faith and belief in God. And in faithfulness and perseverance we hold on to the hope and promise of the one who is always faithful and whose promises are always true that for the believers we are saved in Christ and Christ alone.
Early church fathers:
“We ought therefore, brethren, carefully to inquire concerning our salvation. Otherwise, the wicked one, having made his entrance by deceit, may hurl us forth from our life.” ~ Barnabas (c. 70-130)
“That eternal fire has been prepared for him as he apostatized from God of his own free-will, and likewise for all who unrepentant continue in the apostasy, he now blasphemes, by means of such men, the Lord who brings judgment [upon him] as being already condemned, and imputes the guilt of his apostasy to his Maker, not to his own voluntary disposition.” (Justin Martyr, fragment in Irenaeus’
Against Heresies, 5:26:1, A.D.156)
“God had foreseen… that faith – even after baptism – would be endangered. He saw that most persons – after obtaining salvation – would be lost again, by soiling the wedding dress, by failing to provide oil for their torches.” ~ Tertullian (c. 213)
Apostasy warning
1 Timothy 4:1 English Standard Version (ESV)
Some Will Depart from the Faith
4 Now the Spirit expressly says that in later times some will depart from the faith by devoting themselves to deceitful spirits and teachings of demons,
All in all there are many more scriptures. But by logical reasoning we understand that one wouldn't need to constantly warn the church and believers to guard themselves from false teachers or to remain faithful if God was forcing believers to remain faithful unto the end. Or to say remain faithful in scripture is actually a deceiving message if God is the one who does the persevering in the believers.