You have there someone who really knows the subject. The best people I know can usually sum it up in a few words. For example, I would say, "The true Christian is eternally saved because they never leave the Saviour."
I do not read long posts, just so you know.
Ah, but you did read that one.
I don't all too often post long posts. Others may read me. That too is the point. You are known here by your fruits.
As for True Christian is eternally saved because they never leave the Saviour., I would tell you that Peter left Christ, denied Him three times and before the cock crowed, as Jesus foresaw and told Peter he would do. Peter was an Apostle, and Jesus knew Him ever after, and well past the cock crowing.
That story tells us that while we may leave Christ, Christ who knows us never leaves us. As He promised. As He fulfills.
Perhaps the reason so many are dead set on repeating the oft posted idea that Salvation isn't eternal, is because they don't know what it is to have the Holy Spirit living within. Feeling empty they believe it is possible God will leave if we but do this or that. And yet, what those who believe such always forget is, God knew the sins of the world prior to coming here as His only begotten Son. He died to take all the sins of this world upon Himself on the cross, that whosoever believes shall have immortal everlasting life.
How then can anyone think that our losing faith for whatever cause God would know, would let God to leave us too, after He suffered so much to save us.
Those who walked away from Christ, are not an example of those who lose faith being cast out. (the scripture in the
Book of 1st John chapter 2 and verse 19) Those who left Jesus and His Apostles were the example of the nominal believer. Those who carried the name, faithful in Christ, but were not so. Those are not saved in the first place. Which Jesus knew.)
The next time we encounter those who are dedicated to telling us our Salvation is not secure, consider they're certain of this because they don't know what being secure in Christ and His Salvation is. Otherwise, they'd not feel so assure of something that is not possible for those who know.