If a person who saved through faith, departs from the faith by which he was saved, then what else could it possibly mean? How can you possibly think a person can depart from the faith in Christ Jesus, and still be saved through?
1 Timothy 4:1 - Now the Spirit expressly says that in latter times some will depart from the faith, giving heed to deceiving spirits and doctrines of demons, 2 speaking lies in hypocrisy, having their own conscience seared with a hot iron, 3
forbidding to marry, and commanding to abstain from foods which God created to be received with thanksgiving by those who believe and know the truth.
I presume that you believe "depart from the faith" means that born again believers depart from saving faith in Christ and lose their salvation. The words "the faith" (Greek tês pisteôs) in this context means the apostolic faith, the New Testament apostolic body of doctrines.
Some who are in a state of professing adherence to the apostolic faith, nevertheless will in both doctrine and practice depart from it, giving heed to deceiving spirits and doctrines of demons.
Some "nominal" Christians will abandon the Christian faith, the New Testament apostolic body of doctrines for cults or false religions. That does not prove they were previously born again. In 1 John 2:19, we read -
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.
I believe the beginning of such a major departing from the apostolic faith was evidenced as the Roman Catholic church began to come into existence in the early 4th century. The Roman Catholic church
forbids it's clergy to marry. This same church has other demonic doctrines such as transubstantiation, purgatory, indulgences, papal infallibility, Mary's perpetual virginity etc..
an evil heart of unbelief in departing from the living God;
For we have become partakers of Christ if we hold the beginning of our confidence steadfast to the end,
12 Beware, brethren, lest there be in any of you an evil heart of unbelief in departing from the living God; 13 but exhort one another daily, while it is called “Today,” lest any of you be hardened through the deceitfulness of sin. 14 For we have become partakers of Christ if we hold the beginning of our confidence steadfast to the end, Hebrews 3:12-14
Hebrews 3:14 - For we
have become [past tense Gk. verb, gegonamen, meaning we have become already] partakers of Christ, if we hold fast the beginning of our confidence steadfast to the end. Notice that this is essentially a repeat of verse 6, where we have read: but Christ was faithful as a Son over His house -
whose house we are, if we hold fast our confidence and the boast of our hope firm until the end. The wording is not - "and you will be saved (future indicative) if you (future indicative) persevere." It is rather - "you have been, and now are, really saved, (demonstrative evidence) if in the future you hold fast to Christ."
The point is that not all of these Hebrews have become partakers in their promised Messiah. And of course, the only ones in the end who will be identified as truly born again Hebrews who have partaken in Messiah, will have been those who have held fast the beginning of their confidence steadfast to the end.
Those faltering Hebrews who depart from God begin with loud confidence and profession of loyalty. But later? Future perseverance is proof of genuine conversion.
Hebrews 3:8-10 says, Do not harden your hearts as in the rebellion, In the day of trial in the wilderness, Where your fathers tested Me, tried Me, And saw My works forty years. Therefore I was angry with that generation, And said,
'They always go astray in their heart, And they have not known My ways.' *Not descriptive of believers. There is no loss of salvation here. Only a failure to receive it. Verses 18-19 - And to whom did He swear that they would not enter His rest, but to those who did not obey? So we see that they could not enter in because of
unbelief. That explains the hardened heart. It took them in the opposite direction of God. Considered the truth for a time, then hardened heart and departing from God became their final answer.
Just like in Hebrews 4:1-2, For indeed the gospel was preached to
US as well as to
THEM; but the word which
they heard did not profit THEM, not being mixed with faith in those who heard it. For
we who have believed do enter that rest, as He has said: "So I swore in My wrath, 'They shall not enter My rest," although the works were finished from the foundation of the world. Obviously, not all of these Hebrews were believers. Notice that verses 2-3 makes a
distinction between
US who have BELIEVED and do enter that rest and
THEM who heard the word but did not mix faith with what they heard and will not enter that rest because of UNBELIEF.