Why would the saint choose to walk away? Even the pretender Simon the Sorcerer wanted Peter to pray for him to be spared God's wrath. Any genuine saint will hold fast to Christ and His salvation. But pretenders may not do so. Christians under Rome were willing to die rather than "walk away". So this whole theory is hypothetical and Christians should be focused on Christ, not walking away from Him.
Nobody can lose their salvation since it involves (a) the New Birth, (b) the gift of eternal life, (c) the gift of the Holy Spirit, (d) the gift of Christ Himself within, and (e) being "kept by the power of God". This is no ordinary matter, since Christ is involved at every point.
At the same time, God has ways and means of dealing with His disobedient children. And therefore He tells Christians to examine themselves. But the chastisement of believers is not the same as the damnation of unbelievers. Therefore it is Satan who is behind the false doctrine of loss of salvation. He would love to see everyone in the Hell created for him and his evil angels.
But in the end, GOD DOESN'T TEACH IT THAT WAY. So neither should man. Each man should ARRIVE to that conclusion on his own precept on precept verses on verse THE WAY GOD TELLS US TO TEACH.
Everyone who is a proponent of it says the same thing
and defends THEIR CONCLUSIONS with the reasons their CONCLUSIONS are correct.
BUT
God is specific in THAT IS NOT HOW WE are to TEACH HIS WORDS. So though correct, THE ENTIRE TEACHING OF IT IS AGAINST GODS WILL.
Isaiah 28:5 In that day shall the LORD of hosts be for a crown of glory, and for a diadem of beauty, unto the residue of his people,
6 And for a spirit of judgment to him that sitteth in judgment, and for strength to them that turn the battle to the gate.
7
But they also have erred through wine, and through strong drink are out of the way; the priest and the prophet have erred through strong drink, they are swallowed up of wine, they are out of the way through strong drink; they err in vision, they stumble in judgment.
8 For all tables are full of vomit and filthiness, so that there is no place clean.
9
Whom shall he teach knowledge? and whom shall he make to understand doctrine? them that are weaned from the milk, and drawn from the breasts.
10 For precept must be upon precept, precept upon precept; line upon line, line upon line; here a little, and there a little:
11 For with stammering lips and another tongue will he speak to this people.
12 TO WHOM HE SAID, THIS IS THE REST WHEREWITH YE MAY CAUSE THE WEARY TO REST AND THIS IS THE REFRESHING
YET THEY WOULD NOT HEAR
THEY would rather PROMOTE the conclusions BECAUSE TO THEM (and you can even hear it today in people defending doctrines such as OSASed)
13 But the word of the LORD
was unto them
(and if you don't put the MOCKING and dripping with SARCASM tone into the next verses you miss the whole point of what is HAPPENING IN TODAYS WORLD and what I am trying to say)
precept upon precept, precept upon precept; line upon line, line upon line; here a little, and there a little;
(and this is THE END EFFECT of not doing it Gods way, which we see much of today)
that they might go, and fall backward, and be broken, and snared, and taken.
(and that is what is coming to them)
14
Wherefore hear the word of the LORD, ye scornful men, that rule this people which is in Jerusalem.
15 Because ye have said,
We have made a covenant with death, and with hell are we at agreement; when the overflowing scourge shall pass through, it shall not come unto us: for we have made lies our refuge, and under falsehood have we hid ourselves:
16 Therefore thus saith the Lord GOD, Behold, I lay in Zion for a foundation a stone, a tried stone, a precious corner stone, a sure foundation: he that believeth shall not make haste.
17
Judgment also will I lay to the line, and righteousness to the plummet: and the hail shall sweep away the refuge of lies, and the waters shall overflow the hiding place.
18
And your covenant with death shall be disannulled, and your agreement with hell shall not stand; when the overflowing scourge shall pass through, then ye shall be trodden down by it.
19
From the time that it goeth forth it shall take you: for morning by morning shall it pass over, by day and by night: and it shall be a vexation only to understand the report.
20 For the bed is shorter than that a man can stretch himself on it: and the covering narrower than that he can wrap himself in it.
21 For the LORD shall rise up as in mount Perazim, he shall be wroth as in the valley of Gibeon, that he may do his work, his strange work; and bring to pass his act, his strange act.
22 Now therefore be ye not mockers, lest your bands be made strong: for I have heard from the Lord GOD of hosts a consumption, even determined upon the whole earth.
23 Give ye ear, and hear my voice; hearken, and hear my speech.
24 Doth the plowman plow all day to sow? doth he open and break the clods of his ground?
25
When he hath made plain the face thereof, doth he not cast abroad the fitches, and scatter the cummin, and cast in the principal wheat and the appointed barley and the rie in their place?
26 For his God doth instruct him to discretion, and doth teach him.
27 For the fitches are not threshed with a threshing instrument, neither is a cart wheel turned about upon the cummin; but the fitches are beaten out with a staff, and the cummin with a rod.
28 Bread corn is bruised; because he will not ever be threshing it, nor break it with the wheel of his cart, nor bruise it with his horsemen.
29 This also cometh forth from the LORD of hosts, which is wonderful in counsel, and excellent in working.